Dade Battlefield State Park. This tree is the oldest live oak in the park, and was here 200 years ago for the first battle of the 2nd Seminole War.
Of course, I also watched the film at the visitor's center and checked out the museum. This is a cool place - there's lots going on, from reenactments to craft classes. I wish it had worked out schedule-wise for me to take the pine needle basket weaving class, but they give it monthly and I'll probably be back.