There is a restaurant and an adults only beach as well as a family beach.

Otherwise, you have to buy a day pass which can sell out quickly depending on hotel occupancy) I recommend getting there early (first boat leaves at 7am) and departs every 15 minutes to avoid crowds and to get a good beach chair. If you stay at any of the Renaissance hotels (there is an adult and a family side) a boat will come pick you up at the hotel and take you directly to the island.