You may be right about alligators, but back about 15 years ago I saw two... The first may or not have been in the keys, towards the top I crossed a bridge over a canal, and saw a suspicious stick floating in the water i got out and went down to the edge of the water, and tried to make out what it was. I couldn't tell what it was. A boat came down the canal and all of a sudden the drifting stick started moving counter current or breeze. It was a gator. But it may have been just above the official keys.

Later we got down to deer key, and there was a huge gator in a pond there. It was notorious for chasing people from the pond. A few months after we got back there was a center column of the front page of the Wall Street Journal article about that gator. They had finally got tired of it chasing tourists and eating deer so it had been deported to a gator farm. Maybe it was the last gator in the keys...

Be sure you don't tie your hammock to a poisonwood tree...