Boggy Creek does a terrific airboat ride. East Lake Toho is their main site. I'm not sure if both locations do night time tours, but you might want to try a night tour for something really different.
Another fantastic airboat tour is with Captain Joel Martin at Black Hammock marina. He has 2 tours (huge lake, so the tour is either one side or the other) and both are terrific. We saw SO many gators, as well as other wildlife, and were able to get VERY close to them. (Try URL=http://www.theblackhammock.com]Black Hammock[/URL] )
Enjoy! Airboat tours are a great addition to your vacation.