recumbent bike advocate
Join Date: Sep 2008
Location: Okeechobee. Florida
Bikes: Bacchetta Belladare, long wheelbase
Many people ride to the keys every year, indeed there are a number of organized rides through the keys each year as well, Bubbafest is one. I cannot speak for Miami, and the ability to ride there, but I know that the normal route is to take the Card Sound Bridge and stay off US1 on the northern end of the keys. Further south, through Key Largo and south bike route can be found running parallel to US1 and on the bridges there is usually lots of shoulder to ride. Don't kid yourself, the traffic volume is high and at times fast, so keep your wits about you. As for camping on the beach, I wouldn't advise trying it. There are a couple county and state parks along the way, but during the winter season they tend to stay pretty full as do the private camping areas. But motels are plentiful (and expensive). You might consider looking at Warmshowers or Couchsurfing for hosts in that part of the state. I have not investigated it, but someone may be available.
Good luck with your trip. If you look at Crazyguyonabike.com you may find some journals of others who have biked the keys and garner some good information.
Tractor Tom in Okeechobee, FL