When we first moved to FL, I went swimming in the pool late one night. I saw a palm frond in the pool an swam over and grabbed it to throw it out. Only thing, it was a snake. Walking on water isn't such a big deal.
Florida is loaded with deadly serpents - cottonmouth moccasins, rattlesnakes and copperheads. Of the three, copperheads are the least risk, but you still wouldn't want to get bit, as they can cause serious permanent injury (nerve damage) and they pose a geniune risk to life of a child or old person.