Key West is mostly a walking city because everything is just about within walking distance. If you bring a car to Key West you will quickly find that parking can be quite expensive (if you can find a place to park). Most hotels have bike rentals, or give you use of a bicycle during your stay. A bike is useful if you want to get somewhere quickly, or want to explore many of the side roads off of Duval Street. On your visit you will see many, many bicycles roaming the streets.