As walks go, this was a short one, only about 80 feet. But it was 25 feet above ground — and it swayed as I moved. Up there amidst the live oaks and cabbage palms, I was not just in the foliage but of it.

Florida’s Myakka River Canopy Walk was modeled on canopy walks in the South American rain forests. It’s humble and natural and sturdily built (or at least I pretended that it was).

A 76-foot observation tower on one end let me climb up through the trees to glimpse a panorama of forest and river. I was above the canopy rather than under it.

My knees quivered and I thought about the fear that comes not just from height but from exposure. I felt a kinship with creatures that hide under rocks or brush.

Enclosure is safe. Exposure is dangerous — and exhilarating.