An absolute must visit while on the islands!
I spent the afternoon walking four miles through the Ding Darling Wildlife Preserve. Didn't see much, but did video a wood stork killing and eating a snake! Best viewing is from Wildlife Drive at dawn and dusk, especially good at low tide in morning when tidal flat are exposed. Biking is a good way to travel the drive. Insects are out at best birding hours, but since I was there in the winter, there were no insects! Some alligators are about. Inhingas, flamingos, spoonbills, etc., are to be found. If you are shooting photos, you need at least a 300mm tele, 600 would be better. You can hire private guides who are located outside the park to canoe you in.