Welcome to Tranquility Bay Beach House Resort located in Marathon Florida, the heart of the Florida Keys. Here you will find more than unrivaled peace and seclusion on your Florida Keys resort vacation, while overlooking the sparkling waters of the Gulf of Mexico. Sink into serenity with one of our unique two or three bedroom beach houses. Our spacious Marathon Florida resort beach houses have 2 or 3 bedrooms, 2 plus baths, gourmet kitchens, expansive porches overlooking the water, flat screen TVs, and handmade furniture, offering an idyllic Florida Keys resort experience nestled in a tropical oasis of calm and ease. Now you can also discover the addition of 16 new luxury single-level "Tropical Garden Guestrooms" which offer more intimate accommodations than the resort's larger beach houses. Enjoy all of the amenities of Tranquility Bay Resort with more affordable luxury in mind, and tropical garden views. Next, try award winning dining at Butterfly Cafe, a 2.5 acre white sand beach, world class fishing, diving, snorkeling and water sports, three tropical swimming pools, and our beachfront TJ's Tiki Bar, all framed by 12 acres of picturesque gardens. Located just 90 miles south of Miami and 45 miles north of historic Key West, Tranquility Bay Beach House Resort is easily reached by car or plane. Boasting delicious dining, Florida Keys' attractions, plus a nearby Championship 18-hole golf course, tennis courts, state parks with incredible beaches, protected waters for diving and some of the best sport fishing in the world, you can define your own paradise at our unique vacation destination in the Florida Keys. Find your center in the Middle Keys at Tranquility Bay Resort.