There is the Sandcastle Club at the Beach Club. I think that would be the closest. Or you could go for in-room sitting through Fairy Godmothers. They have been in business nearly as long as WDW has and they are fantastic. In fact, they are the only babysitters either of my kids had that wasn't family! They bring games/puzzles/activities for the kids, plus the kids are able to go to bed when they are tired. I can highly recommend them.