Ride a Bike!, Miami
This is the first time we had seen bike hire in any country, and what a great idea it is too. There are a few of these and all you do is put your credit card and details into a pay machine, and take your bike for the time you have agreed. The services are available from some for 24 hours a day.
We didn't hire one, but we saw plenty of people who did, and we were told the rates where really good. If we hadn't been driving everywhere and had other places to see on our 6 week road trip, we would have hired one ourselves.