For the trolly in Key West, I have read a couple different things. If we book through the ship, it's once around and done. If we go in and book ourselves, the kids are free and we would have on/off privileges. I couldn't find any information about how far the walk would be from the port. Does anyone know?
We went on the Old town trolley, which was very close to the pier, just a block over. Old Town Trolley had a few designated stops which you can get on and off at.