Seeing from some of your other posts that you have a 19' RV, you should be OK driving to and around Key West. Be prepared to spend a lot of extra money, if you want to park in a parking lot. I was down there a number of years ago in a 24' class C, and I believe they wanted $20 or $25 at a lot. We ended up just going over to the beach and parking there for free, for a few hours in the afternoon. There are plenty of places in Key West where you can rent scooters. Definitely would advise against riding a scooter from Bahia Honda to Key West.
2014 Itasca Spirit 31K Class C
2016 Mazda CX5 on Acme tow dolly- 4 trips ~ 5,800 mi
Now 2017 RWD F150 with a drive shaft disconnect