By the way. A tip from a local. Stock Island and Key West will be the most congested parts of the ride. Most mapping programs will have you turning right onto North Roosevelt Blvd (which turns in to Truman Ave). With all the tourists here this can be slow. At the very least you'll encounter lots of stop-lights and crosswalks. There are two alternatives. One is to go down the center of the island (the Flagler Route), and other is to go around the southern edge of the island (the Airport Route). On any given day, both are faster than battling through North Roosevelt/Truman.
The Flagler route is 4-lanes (divided), and has a couple lights.
The Airport Route is obviously more scenic. More importantly, it is 4-lane with no stops and no traffic until you reach the left-turn onto Atlantic around mid-island.
The residential "Old Town" part of Key West (the southwestern area - north of Higgs Beach) looks intimidating with all the intersections. It's actually very quick and stress-free to get through.