Just a five-minute boat ride from Marathon, Seabird Key is a 10-acre private island available for rent by the week. The island is home to an eight-person guesthouse, surrounded by tropical gardens; a bird sanctuary filled with pelicans and herons; and a white-sand beach strung with hammocks. Also available to guests are three kayaks and a 19-foot boat with a towing tube and snorkeling equipment. Designed in an Old Florida style, the house has large louvered windows, hardwood floors, island-print fabrics, and French doors opening onto multilevel decks. There’s also a fully equipped kitchen, with chef services available upon request.