R.T.
Have you ever been to Sanibel? They have hotels in every price range and pretty much all of them are on the beach. Sanibel is on the west coast of Florida on the Gulf, so I'm not sure if the oil spill has effected the beaches, so you may want to look into that.... but it's an incredible shelling island and you don't have to worry about big waves since it's the gulf and not the ocean. You can just hang at the hotel pool and beach all weekend long, or there are lots of other things to do on the island. Google it and see what you can find
Another thought is the Nickolodeon hotel, which has cool kid themed rooms, a huge, awesome pool area with daily activities by the pool, and stuff like special movies and game shows