I think they've done a nice job of cleaning the place up. clearing the trails, painting the post-and-rails and putting up all the usual verbiage, without making the experience too suburban. It's worth a visit and to get here take the left hand street from the light at Highway One in Big Pine. The left-hand street is Key Deer Boulevard,straight as an arrow:
The back roads around the Blue Hole are pretty much straight too:
So it is eighty degrees but the roads are straight. Take your pick if your motorcycle is weatherised for winter. Puerto Rico has interesting roads but you need Spanish to make it there, and road trips are perforce short as the island is a hundred miles long. The Florida Keys are an excellent compromise.