My group of 6 just returned from AC and we stayed in 3 condos at Banana Beach. It's a great property, and Tim and the front desk staff are the nicest, most helpful people. We paid $600 for a week for each condo, and Tim was kind enough to upgrade my condo to an oceanfront unit for the first three days. Incredible sunrises. The rooms are large and the bedroom air conditioner was more than enough to cool the whole place. The housekeepers will wash any dishes in the sink every day. There is a small grocery store across the street for ice cream, snacks, cereal, soda, etc. We brought peanut butter, jam, bread, and cereal with us from the States and bought lowfat milk and some other things from Island Supermarket. Peanut butter there was about $7. Bring ziploc baggies with you from home and you can take PB&J sandwiches on any of the snorkeling/scuba/hiking trips. PB&J is almost indestructible and good energy food.
For a week at Banana Beach, a golf cart is a good investment. Rent them in town, they're cheaper. Carts R Us is a good choice, we got 2 four-passenger carts for a week for $240 total. I'm hoping to post a trip report this weekend, but we all had a fantastic time there!