This was a great way to end the ride, past Islamorada the Keys open up and become much more like you imagine them to be when you see them on the map, a single road stretching out into the sea with frequent stops at tiki bars and marina restaurants. And then it was into Key West down to Mile 0 and the trip is done!
The distance worked out at just over 2400 miles in the end. Counter-intuitively, cutting inland to avoid the flooding actually cut the ride by around 100 miles. I travelled through 13 states altogether.