A memorable place to take them would be to the La Chua Trail in Gainesville. It is part of Paynes Prairie. Have been there several times and never disappointed.
La Chua Trail | Florida Hikes
Although it's an hour/hour and a half drive and you pay $4 I think to park, it's a nice easy walk along the slightly elevated trail. Loads of alligators. We've seen the wild horses out there too. Might need binoculars or a zoom camera to see them.