If your trip to Marathon, FL Airport (MTH-Florida Keys Marathon) is all booked but your travel itinerary is a little on the empty side, let us give you a helping hand.Sombrero Beach won't take very long to get to from the airport. Head out and discover what all the hype is about.Cruise straight from the arrivals hall to The Turtle Hospital. Other sights you shouldn't miss include Curry Hammock State Park and Sunset Park Beach.