For local transportation there are a few options:
Rental cars are available at Marathon Key airport.
Taxi: There are several taxi services. Rates are approximately $6 to any point within Marathon, plus $1 for any waiting time.
Scooter & Motorcycles: You’ll have to travel to Key West to rent these, and they range from approx. $50 – $200+ per day depending on make and model.
Monroe Country Bus: There is a local bus that services Marathon.