Just got back from 9 days at AC. This is a really lovely place to stay and chill. If you can get one of the rooms near the beach then do so, despite the fact you are at the bottom of the steps it pays off especially in getting to the beach etc.
The other option is for Jade Mountain, which while very nice, is a bit too much concrete and right angles for my tastes. This place has a bit more charm.
There is loads to do here too, of course water sports are the main activity, but if you want a blast then the Jungle Biking is way cool. Jovan took me out, but the real fun is absolutely firing around the course/s!!! Watch out for trees and keep your eyes at least 6-12 feet ahead..absolutely epic!