Yes, most hotel bookings are fully refundable provided that you cancel before the accommodation's cancellation deadline, which is usually within 24-48 hours of your check-in date. If you booked a non-refundable reservation, you might be able to still cancel and be given a refund within 24 hours of your booking. Plug in your dates, click on "Search", then use the filter option "fully refundable" to review the best deals near The Great Blue Hole at Lighthouse Reef.