Does anyone know how bikable are the Florida Keys? I've been vaguely aware of the Keys, but this is the first time I've been in a cycling frame of mind when I glanced at a map. It seems like it would be an awesome way to vacation.

Spot checking with Google Street View, it seems like some stretches of US-1, especially between islands, are just highway with shoulder. Is it even legal to bike on the Overseas Highway?