The only one that comes to mind right now as a family oriented resort is Sea Mist. I have heard good things about it in the past (I grew up there so I didn't actually stay at any of the hotels), but I have been in Florida for the last 13 years, so it could have changed.
If you are familiar with the area, the Pavilion closed last year, and as of my last visit it had been mostly dismantled, and the only amusement area right now is Family Kingdom, which is very close to Sea Mist. I think they have a water park in the area as well.
HTH,
Amie