In case you haven't been to the Keys before, look at a map before you reserve anything. That's a two lane highway all the way to Key West after you leave the mainland and traffic can be terrible, especially if there's an accident. Key Largo, for example, is at least 2-1/2 hours from Key West in ideal conditions. There are a number of nice private campgrounds, they're just a bit pricier, like everything else down there.
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!