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The ISO by Castle

3.5 star property
Beachfront, with outdoor pool

Choose dates to view prices

Photo gallery for The ISO by Castle

Outdoor pool
Beach House Suite (2nd floor, stair access only) | Beach/ocean view
Beach House Suite (2nd floor, stair access only) | Balcony view
One Bedroom Ocean View (2nd Floor, stair access only) | Private kitchenette | Fridge, coffee/tea maker
One Bedroom Ocean View (2nd Floor, stair access only) | Living room | 42-inch flat-screen TV with cable channels, TV
Travelers find their rhythm at The ISO by Castle, where the white sand beach extends the resort. Snorkeling is at guests' doorstep, the outdoor pool offers a refreshing alternative, bike rentals ease coastal exploration, and the water dispenser keeps everyone hydrated.

Reviews

8.4 out of 10
Very good

Popular amenities

  • Bar
  • Air conditioning
The current price is NT$8,532
NT$11,147 total
includes taxes & fees
Oct 31 - Nov 1

Room options

Available filters for rooms
Showing 7 of 7 rooms

View all photos for Ocean View (1st - 3rd Upper Floors, stair access only

1 bedroom, laptop workspace, blackout drapes, Internet

Ocean View (1st - 3rd Upper Floors, stair access only

8.6 out of 10
Excellent
(63 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Separate bedroom
Ceiling fan
Blackout drapes/curtains
  • 290 sq ft
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Ocean Front View (1st - 3rd Upper Floors, stair access only)

Ocean Front View (1st - 3rd Upper Floors, stair access only) | 1 bedroom, laptop workspace, blackout drapes, Internet

Ocean Front View (1st - 3rd Upper Floors, stair access only)

7.8 out of 10
Good
(30 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Separate bedroom
Ceiling fan
Blackout drapes/curtains
  • 290 sq ft
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Deluxe Room, Ocean View (2nd Floor - stair access only)

Deluxe Room, Ocean View (2nd Floor - stair access only) | Living area | 42-inch flat-screen TV with cable channels, TV

Deluxe Room, Ocean View (2nd Floor - stair access only)

7.8 out of 10
Good
(14 reviews)

Highlights

Balcony
Separate sitting area
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Separate bedroom
Ceiling fan
  • 290 sq ft
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed OR 2 Double Beds

View all photos for One Bedroom Ocean View (2nd Floor, stair access only)

One Bedroom Ocean View (2nd Floor, stair access only) | Private kitchenette | Fridge, coffee/tea maker

One Bedroom Ocean View (2nd Floor, stair access only)

9.0 out of 10
Wonderful
(2 reviews)

Highlights

Balcony
Separate dining area
Separate sitting area
Air conditioning
Free cribs/infant beds
Kitchenette
Refrigerator
Flat-screen TV
  • 580 sq ft
  • 1 bedroom
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed

View all photos for Beach House Suite (2nd floor, stair access only)

Beach House Suite (2nd floor, stair access only) | Living area | 42-inch flat-screen TV with cable channels, TV

Beach House Suite (2nd floor, stair access only)

10.0 out of 10
Exceptional
(1 review)

Highlights

Balcony
Separate dining area
Separate sitting area
Air conditioning
Free cribs/infant beds
Kitchen
Refrigerator
Dishwasher
  • 640 sq ft
  • 1 bedroom
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Queen Sofa Bed

View all photos for Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only)

Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only) | View from room

Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only)

9.4 out of 10
Exceptional
(6 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Separate bedroom
Ceiling fan
Blackout drapes/curtains
  • 290 sq ft
  • Partial ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

Premium Ocean Front View (1st - 3rd Upper Floors, stair access only) | 1 bedroom, laptop workspace, blackout drapes, Internet

Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

10.0 out of 10
Exceptional
(1 review)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Separate bedroom
Ceiling fan
Blackout drapes/curtains
  • 290 sq ft
  • Ocean view
  • Sleeps 3
  • 1 King Bed
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About the neighborhood

Located on the beach, The ISO by Castle is in Waipouli, a neighborhood in Kapaa. Holoholoku Heiau and Hikinaakala Heiau are local landmarks, and travelers looking to shop may want to visit Coconut Marketplace and Kapaa Shopping Center. Smith's Tropical Paradise and Lydgate Beach are also worth visiting. Spend some time exploring the area's activities, including golfing.
Visit our Kapaa travel guideOpens in a new window
View more Resorts in KapaaOpens in a new window
Map
4-796 Kuhio Hwy, Kapaa, HI, 96746

What's nearby

  • Waipouli Beach - 3 min walk - 0.3 km
  • Coconut Marketplace - 14 min walk - 1.2 km
  • Lae Nani Beach - 3 min drive - 1.5 km
  • Kapa'a Beach Park - 4 min drive - 2.6 km
  • Smith's Tropical Paradise - 6 min drive - 3.0 km

Getting around

  • Lihue Airport (LIH) - 14 min drive

Restaurants

  • ‪McDonald's - ‬4 min walk
  • ‪Starbucks - ‬6 min walk
  • ‪Sensei Sushi Bar And Grill - ‬14 min walk
  • ‪JoJo’s Shave Ice - ‬15 min walk
  • ‪Waipouli Deli & Restaurant - ‬3 min walk

About this property

The ISO by Castle

Resort located in Waipouli
Take advantage of a garden, a bar, and a restaurant at The ISO by Castle. This resort is a great place to bask in the sun with a beachfront location, beachfront dining, and snorkeling.
Other perks at this resort include:
  • An outdoor pool
  • Bike rentals, smoke-free premises, and a water dispenser
  • Guest reviews speak highly of the beach locale, pool, and helpful staff
Room features
All 78 rooms have comforts such as laptop-friendly workspaces and air conditioning, as well as thoughtful touches like high-speed internet. Guest reviews speak positively of the clean rooms at the property.
Other conveniences in all rooms include:
  • Bathrooms with shower/tub combinations and free toiletries
  • 42-inch flat-screen TVs with cable channels
  • Wardrobes/closets, balconies, and refrigerators

Similar properties

Balcony

Aston Islander on the Beach

  • Pool
  • Air conditioning
  • Bar
  • Laundry
8.6 out of 10, Excellent, 1,014 reviews
The price is NT$6,507
NT$8,650 total
includes taxes & fees
Nov 11 - Nov 12
Aston Islander on the Beach

Property amenities

Internet

  • Available in all rooms: High-speed internet

Food and drink

  • A bar/lounge
  • A restaurant

Restaurants on site

  • The Bullshed Restaurant

Things to do

  • Bicycle rentals
  • Outdoor pool
  • Snorkeling
  • Yoga classes

Family friendly

  • In-room refrigerator
  • Outdoor pool

Conveniences

  • Limited-hour front desk
  • Water dispenser

Outdoors

  • Garden
  • On the beach

Accessibility

  • No elevator

More

  • 3 floors
  • 5 buildings
  • Smoking not allowed
  • Water dispenser usage encouraged

Room amenities

Bedroom

  • Bedsheets provided
  • Blackout drapes

Bathroom

  • Free toiletries
  • Private bathroom
  • Shower/bathtub combination
  • Towels provided

Entertainment

  • 42-inch flat-screen TV with cable channels

Food and drink

  • Coffee/tea maker
  • Refrigerator

More

  • Air conditioning
  • Ceiling fan
  • Laptop workspace

Policies

Check-in

Check-in start time: 3:00 PM; Check-in end time: 10:00 PM
Minimum check-in age: 18

Check-out

Check-out before 11 AM
Late check-out subject to availability
A late check-out fee will be charged

Special check-in instructions

The front desk is open daily from 7:00 AM - 10:00 PM
Front desk staffed during limited hours

Access methods

Front desk (limited hours)

Pets

Pets not allowed

Children and extra beds

Children are welcome
Rollaway/extra beds are not available

Property payment types

Important information

Fees

You'll be asked to pay the following charges at the property. Fees may include applicable taxes:

  • Resort fee: USD 35.38 per accommodation, per night
The resort fee includes:
  • Additional inclusions
  • Fitness/yoga classes
  • Newspaper
  • Parking
  • Self parking
  • WiFi access (may be limited)

We have included all charges provided to us by the property.

Optional extras

  • Late check-out is available for a fee (subject to availability)

The above list may not be comprehensive. Fees and deposits may not include tax and are subject to change.

You need to know

Extra-person charges may apply and vary depending on property policy
Government-issued photo identification and a credit card, debit card, or cash deposit may be required at check-in for incidental charges
Special requests are subject to availability upon check-in and may incur additional charges; special requests cannot be guaranteed
Tax ID - W-34434930-01
This property accepts credit cards and debit cards; cash is not accepted
Safety features at this property include a smoke detector
This property has outdoor spaces, such as balconies, patios, terraces which may not be suitable for children; if you have concerns, we recommend contacting the property prior to your arrival to confirm they can accommodate you in a suitable room

We should mention

This property does not have elevators
Only registered guests are allowed in the guestrooms

Property is also known as

Castle Mokihana
Castle Mokihana Hotel
Castle Mokihana Hotel Kapaa
Castle Mokihana Kapaa
Mokihana Of Kauai Hotel Kapaa
ISO. Island. Sky. Ocean. Resort Kapaa
ISO. Island. Sky. Ocean. Resort
ISO. Island. Sky. Ocean. Kapaa
ISO. Island. Sky. Ocean.
ISO Sky Ocean Resort Kapaa
The ISO by Castle Kapaa
The ISO by Castle Resort
The ISO. Island. Sky. Ocean.
The ISO by Castle Resort Kapaa

Frequently asked questions

Does The ISO by Castle have a pool?

Yes, this property has an outdoor pool.

How much does it cost to stay at The ISO by Castle?

As of 2025/10/12, prices found for a 1-night stay for 2 adults at The ISO by Castle on 2025/10/31 start from NT$8,532, excluding taxes and fees. This price is based on the lowest nightly price found in the last 24 hours for stays in the next 30 days. Prices are subject to change. Choose your dates for more accurate prices.

Is The ISO by Castle pet-friendly?

No, pets are not allowed at this property.

What time is check-in at The ISO by Castle?

Check-in start time: 3:00 PM; Check-in end time: 10:00 PM.

What time is check-out at The ISO by Castle?

Check-out is at 11 AM. Late check-out is available for a fee (subject to availability).

Where is The ISO by Castle located?

Nestled on the beach, this Waipouli resort is within 1 mi (2 km) of Waipouli Beach, Fuji Beach, and Lae Nani Beach. Coconut Marketplace and Kapaa Shopping Center are also within 1 mi (2 km).

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Reviews

The ISO by Castle Reviews

8.4

Very Good

8.8

Cleanliness

9.0

Location

8.4

Staff & service

8.4

Eco-friendliness

8.2

Property conditions & facilities
Rating 10 - Excellent. 480 out of 1001 reviews
Rating 8 - Good. 330 out of 1001 reviews
Rating 6 - Okay. 120 out of 1001 reviews
Rating 4 - Poor. 41 out of 1001 reviews
Rating 2 - Terrible. 30 out of 1001 reviews

Reviews

8/10 Good

Danna

Liked: Cleanliness, property conditions & facilities
Nice place to stay that is a quick walk or drive to several other areas.
Stayed 6 nights in Aug 2025

10/10 Excellent

Samantha

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Loved this place. We enjoyed our room, staff was always nice and friendly. Loved being able to check the bikes out. For the price for the ocean view, you can’t beat it. Would definitely stay here again!
Stayed 6 nights in Sep 2025

10/10 Excellent

Leesa

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Such a nice getaway my husband and I had at the ISO. From our room we could look out at the pool and beautiful ocean. Super comfy bed and pillows. Great size room. The staff is super nice and helpful. So friendly too! I will definitely stay there again once I get back to Kauai
Stayed 2 nights in Sep 2025

10/10 Excellent

Angel

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Loved the ocean view from my room. The room was clean and staff was super friendly and helpful to all my questions. Most importantly to me was that the walls were thick or insulated enough that i couldn't hear any of the adjacent neighbors through them.
Stayed 3 nights in Sep 2025

10/10 Excellent

Carolyn

Liked: Cleanliness, staff & service, property conditions & facilities
Always love coming here. Disappointed that the restaurant was under construction. Beautiful sunrises. Helpful staff.
Stayed 6 nights in Sep 2025

10/10 Excellent

Mengqing

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
It's a very good safe place to stay.
Stayed 4 nights in Jul 2025

8/10 Good

Ying

Liked: Cleanliness, staff & service, property conditions & facilities
Very good location, easy to get food from Safeway and
Stayed 7 nights in Aug 2025

10/10 Excellent

Siham

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Amazing
Stayed 3 nights in Aug 2025

8/10 Good

Paul

Liked: Cleanliness, staff & service
Great location nice restaurant attached to Hotel. No beach for swimming though but very nice location on the water. Nice pool very quiet location.
Stayed 2 nights in Jul 2025

10/10 Excellent

James

Liked: Cleanliness, staff & service, property conditions & facilities
Good but the restaurant attached was not the best
Stayed 3 nights in Aug 2025

8/10 Good

Donna

Liked: Cleanliness, amenities, property conditions & facilities
Great location, bikes were nice for the bike path, breakfast,grab and go was helpful.. property was older but well kept.
Stayed 4 nights in Jul 2025

10/10 Excellent

Codey

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Excellent location very nice staff , our ac unit was faulty However with it only being a 2 night stay it wasn’t worth the hassle, they were extremely friendly I’m sure if I pushed the issue they would have dug into it, also was fully booked
Stayed 2 nights in Aug 2025

8/10 Good

Inessa

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
closwe3d to conference
Stayed 6 nights in Aug 2025

6/10 Okay

christi

Liked: Cleanliness, staff & service, amenities
Disliked: Property conditions & facilities
Na
Stayed 7 nights in Aug 2025

10/10 Excellent

Irvin

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
amazing view nice hotel
Stayed 4 nights in May 2025

10/10 Excellent

Hayley

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Amazing place to stay in Kauai! 10/10 recommend. Friendly staff, prime location, beautiful grounds, clean rooms!
Stayed 3 nights in Jun 2025

8/10 Good

CHUNMEI XIE VAN

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
The staff were very friendly and very accommodating to make our stay enjoyable. Our room was quite comfortable with a kitchen and separate bedroom although there were a few areas needing minor repair and painting.
Stayed 7 nights in Jul 2025

2/10 Terrible

Judy B

Disliked: Cleanliness, staff & service, property conditions & facilities
The view was okay and also the pool. We only stayed 2 nights instead of 4 nights we moved to another hotel nearby ,the room smells bad & carpet very old ,need renovation ,no bar no restaurant because they’re under renovation. The front lobby was also not nice .I m not recommending to stay in this hotel .
Stayed 4 nights in Sep 2025

10/10 Excellent

Kyle

Liked: Cleanliness, staff & service, property conditions & facilities
Our stay was great! The ISO is in a great location within walking distance to several beaches and food options.
Stayed 2 nights in May 2025

6/10 Okay

Al

Liked: Cleanliness, staff & service, amenities
I like the property it’s close to a beach and nice views and if you want, you could just swim in the pool. Too bad there wasn’t a jacuzzi, but it wasn’t a deal breaker. The room was okay, the bed was comfortable and the room was clean. The restaurant on premises was great! The hotel was close to shopping and places to eat. All in all, it was a great place to stay!
Stayed 2 nights in Jul 2025

10/10 Excellent

Catherine Clare

Liked: Amenities
The rooms were clean but the property is run down in a few areas. Customer service was good but one of the ladies at check didn’t appear to like her job. I don’t have her name but she was the middle aged blond lady. Everyone else was wonderful.
Stayed 3 nights in Aug 2025

10/10 Excellent

Brian

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
The ISO is a great affordable option to some of the other overblown resorts in the area. Rooms are clean and comfortable, staff is helpful, and the hotel is conveniently located close to some great restaurants and island excursions. While it may not have the bells and whistles of nearby options, it has a pool, a great continental breakfast, and EVERY room is ocean-view.
Stayed 7 nights in Jun 2025

10/10 Excellent

DWARAKESH

Liked: Property conditions & facilities
Great views outside the balcony
Stayed 3 nights in Jun 2025

10/10 Excellent

Steve

Liked: Cleanliness, amenities, property conditions & facilities
Nothing to dislike like about the stay. Will recommend for friends for certain who want to visit Kauai. Experience was amazing, along with the staff.
Stayed 2 nights in Jul 2025

10/10 Excellent

Celina

Liked: Cleanliness, staff & service, property conditions & facilities
Great location, friendly staff, good amenities
Stayed 4 nights in Apr 2025

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