Showcaae of Citrus is a fun place for the kids. They can pick fruit, run around & take a swamp buggy ride.
Things to Do (if I did it right, that should be their website)
They have a Mermaid show at Weeki Wachee Springs
WeekiWachee.com - Home (I haven't been there yet, but it sounds cute)
You can also take a golf cart ride over the bridge to the historical side and back. (it's like a rollercoaster ride for a 2 year old)