I booked a cabana in July 2015 and it was a good decision. Given the number of us (11) and the heat, it made for a nice place to chill out in the shade and not have to fight over lounge chairs. Our cabana attendant - Brittany (Brit) was excellent. She made us drinks, came by often and suggested things for us to order to meet our food and beverage minimum ($800).
You can order pitchers of iced tap water which is free vs. bottled water. If you order bottles of liquor (which are liter size by the way) you get you choice of mixers included in the price.
Message me if you have any questions about details.