Wahoo’s Poolside Bar & Grill at Palace Casino Resort is also accessible by boat and has a menu of coastal favorites, seafood, sandwiches and drink specials liked their popular Bushwacker. Most of the other casinos are open for hotel guests only, but have fun poolside restaurants that are open to the public. Those under age 18 must be accompanied by an adult. Garden Oasis Pool is open to outside customers only if they rent a cabana. Scarlet Pearl Casino has the same policy. Adult only swim for ages 21 and older every night from 6 p.m. Hollywood Gulf Coast: The 350-foot long lazy river and pool complete with sun deck, hot tub and swim-up bar are open to hotel and RV guests only or to those who rent a cabana, starting at $100, and with reservations required. Casino pools for guests or cabana purchases only The pool at Hard Rock Casino Biloxi is complete with a swim-up bar.