I have now booked a cheap hotel (average reviews, but I can live with that in return for the location) on the oceanfront in South Beach, Miami for the first two nights. And I've booked into the Ramada in Key Largo for the Sunday (very cheap deal) on the basis that the traffic heading north out of the circuit is said to be hellish.
I have been unable to pre-book camping in the Everglades National Park but one website that I visited suggested that there might be a number of 'walk-up' sites there - does that mean 'first-come, first-served'?
I was reading about what to do in the Keys and had the bright idea of travelling to the Dry Tortugas National Park which is 70 miles off Key West. I then realised that they had a campground there which sounds pretty cool! I searched this site but I couldn't find mention of anyone here who had done that -- is that the case?