"The rooftop mixed onsen was a big surprise, but super nice as we don't usually get to be with family members of other sex. (You do provide basic swimwear). It was so nice to look over the lake and just chill out in the onsen upstairs, but the main onsen were also incredible. Food options were plenty in the restaurant (buffet style), and it's so close to the Ainu Kotan... definitely worth a visit!!"