Watermania on international drive is fun and doesn't cost allot compared to the other parks. About an hour up the road is Silver Springs in Ocala, FL. Worth visiting! Natural Florida. Also I think that the Manatees are running at that time. First check with a local, if they are - go to Crystal River, FL. It's about and hour or so NW of Orlando. They hang out near the Nuke power plant discharge. It's warm water and they love it. There fed cabbage and lettuce from park rangers, quite an experience.
I'll come up with some more stuff later
Jeff