I went with my family in '95 at the end of my high school year in Georgia. This was a marvelous experience and we still talk about it today, almost 20 years later.

Okefenokee is a huge swamp off the beaten track. As such the park rangers take a live and let die approach to visitors. You can rent canoes and off you go.

Quite quickly you are alone in your canoe. If you discount the alligators, snakes and other reptiles that is. Expect small alligators to peak out of the water right next to your canoe. The land is crowded with snakes ...

This would be a great addition to the list. And it makes for a great day in any case.