Online Reservation

Relax at Our Luxury Florida Keys Resort

A Tropical Oasis in the Keys

Tranquility Bay Beach House Resort offers an idyllic blend of luxury accommodations, with 2- and 3-bedroom Florida Keys beachfront rentals directly facing the Gulf of Mexico. We additionally offer new single-level Tropical Garden Guestrooms with lovely tropical views. Tranquility Bay Resort is located in Marathon, Florida, less than one mile from Marathon Airport, and within easy driving distance of Miami (90 minutes) and historic Key West (45 minutes).

Resort Features and Amenities

  • Single-level guestrooms (King and Double Queen options) with private porches and entrances, and water views dependent on room type.
  • Laundry facilities.
  • Putdoor lagoon-style swimming pool.
  • Three swimming pools (one adult relaxation pool).
  • Putting green by Nicklaus Design.
  • Onsite water sports.
  • Fitness room with cardio equipment and weights.
  • Original, site-specific artwork and sculpture throughout the resort.
  • In-room spa services upon request (pre-booking required).
  • Butterfly Café restaurant and Beachside Tiki Bar open daily.

Delve into our resort map, and begin dreaming of your escape. 

Quick Facts

  • Resort Fee: $30.00 per night. Rates and resort fee do not reflect 12.5% applicable taxes. 
  • Lobby Hours: 6:30 PM to 11:00 PM.
  • Check-In: After 4:00 PM.
  • Late Arrival: After 11:00 PM - Must contact resort prior to arrival.
  • Check-Out: Before 11:00 PM.
  • Late Departure: After 11:00 PM - Subject to a late check-out fee.
  • Tranquility Bay has a minimum age requirement of 25 years to reserve a room. Upon check-in this will be confirmed by photo ID. Guests beneath the age of 25 must be accompanied by a guest 25 years or older during the full course of their stay. Parties unaccompanied by an adult of 25 years or older may be asked to leave at any time during their stay.
  • Tranquility Bay Beach House Resort is a 100% non-smoking hotel. We request guests maintain our smoke free Resort policy. Smoking is not allowed in the beach houses, porches, Tiki Bar, restaurant, lawns, pathways, beach or pool areas.


Tranquility Bay Beach House Resort offers 87 luxury two- and three- bedroom Marathon, Florida vacation rental houses, all with spectacular views of the Gulf of Mexico. Each home features a fully equipped gourmet kitchen, two and a half bathrooms, laundry facilities, cable service, luxurious bed and bath linens, whimsical painted furniture, locally inspired artwork, wireless high-speed (WI-FI) Internet, daily maid service, and spacious porches with water views. If you're looking for smaller, more intimate accommodations, try one of our new Tropical Garden Guestrooms - these single-level accommodations are comparable to a spacious hotel room with garden views.

A guest room with a glass panel doors that open to a private porch.

3 Pools and a Private Beach

Tranquility Bay Resort offers guests the choice of three swimming pools. The main lagoon-style pool is set in a tropical oasis, with a second pool for adult-only use, and a third, much smaller and more intimate pool located in the secluded Tropical Garden Guestroom area. Guests also love our private white sand beach, spread over 2.5 acres and accessible by a small beach entry access area and a shallow swimming lagoon.

Please note that at certain times of the year, a prevailing north wind can bring sea grass to our beach. While we work hard to clean the beach regularly, it is sometimes impossible to remove all of the sea grass due to wind direction. Local restrictions prevent us from permanently removing sea grass from the water and we are therefore required to place the grass into another location of the ocean. 

Watersports and Activities

Lovers of the outdoors will find true excitement in the vast range of watersports offered onsite. The experts at Turtle Island Watersports provide the best in fishing charters, diving, snorkeling, sailing, personal watercraft rental and back country eco-tours. Options for the truly adventurous include skydiving and flying in a fighter jet.

Fine Dining at Butterfly Café

The #1 rated restaurant in Marathon, Butterfly Café features enticing tropical world cuisine. Open daily for lunch and dinner, we welcome you to enjoy fine dining on the porch or in the elegant dining room. For families with children, a special children's menu offers great variety and value. For lighter fare accompanied by creative tropical drinks, visit TJ's Tiki Bar directly on the beach.

TJ's Tiki Bar at sunset.