We rented a cabana for our August 2012 visit, and LOVED it

. It was a great splurge. After visiting in January 2012 and doing the dolphin swim, on our August trip we decided to omit the dolphin swim and go with the cabana instead, and it was a great choice for us. We wanted a relaxing day and that's exactly what we got.
We went for the premium package, rather than the cabana only, as the cabana-only rentals are not released until much closer to your travel date (whereas the package cabana rentals can be secured anytime). It was a good deal, as the package came with a DC t-shirt, a DC sling pack, a beautiful glass frame, a free 6 x 8 adventure photo print, a personalized buoy (which is delivered to your family by a dolphin during your swim if you opt for that), an underwater camera, and 25% off a photo package.
You get service to your cabana by a personal attendant. We had Joan, and she was fabulous, super friendly, and very attentive. The attendant will stock your fridge with beverages of your choice (including alchohol) and brings you a basket of snacks to have right at your cabana table. She or he will refill with whatever quantities and items you want.
Our cabana was located right beside the Grand Reef. We loved the location. This was our view:
There was a locker and a ceiling fan right inside the cabana, so there was no need to use the group lockers by the change rooms.
We very much enjoyed having a "home base" to come back to, and a spot to enjoy a siesta out of the sun on a steamy August afternoon.
Any other questions, feel free to ask!