Atlantis in the Bahamas. You can pay and get certain things, such as the slides and pools and the aquarium, maybe the casino im not sure. I forget about food and drink though, but definetely try out the atlantis, totally worth it
We sailed to the Bahamas two summers ago and one of the families we ate with booked a room at the Comfort Suites that is across the street from Atlantis which has use of there facilities. They booked this room before leaving home. Don't wait till you are on ship do it ahead of time!