Online Reservation

Welcome to Marathon Florida

Learn More About Our Florida Keys Resort

Tranquility Bay Beach House Resort offers an idyllic blend of luxury accommodations, from beach houses to tropical guestrooms. You’ll find us less than one mile from Marathon Airport, and within easy driving distance of Miami (90 minutes) and historic Key West (45 minutes).

Relax, You've Arrived

View your home away from home here.

Resort Features 

  • Elegantly furnished accommodations, all with either beach or garden views
  • Accessible rooms available
  • Picturesque waterfront setting
  • Three swimming pools, including one adult relaxation pool and a lagoon-style pool
  • Onsite watersports with Turtle Island Watersports – diving, snorkeling, kayaking, and more
  • Over 1,000 ft. of shoreline
  • 2.5 acres of private sandy beach with a shallow swimming lagoon
  • World-class dining at our Butterfly Café restaurant
  • Beachside Tiki Bar open daily
  • Putting green by Nicklaus Design
  • Fitness room with cardio equipment and weights
  • In-room spa services upon request (pre-booking required)
  • Laundry facilities (beach houses only)
  • Original artwork throughout

View our resort map or our online planning guide for more information.

Quick Facts

  • $35 resort fee per night (excluding 12.5% applicable taxes)
  • Lobby hours: 6:30 p.m. to 11:00 p.m.
  • Check in: after 4:00 p.m.
  • Late arrival: after 11:00 p.m. – please contact us prior to your arrival
  • Check out: before 11:00 a.m.
  • Late departure: after 11.00 a.m. – subject to a late check out fee
  • Minimum age: we have a minimum age requirement of 25 years to reserve a room. Upon check in this will be confirmed by photo ID. Guests under the age of 25 must be accompanied by a guest aged 25 years or older during the full course of their stay. Parties unaccompanied by an adult over 25 years may be asked to leave the resort at any time.
  • Pools: Pools close at dusk due to turtle lighting restrictions 
  • Room Limit: Please note room occupancy limits when booking - children are counted as one person in the booking party, regardless of age
  • Parking: Only guest vehicles can be parked in the hotel's parking lots. Parking for recreational vehicles, boats, trailers and other oversized vehicles is not permitted at Tranquility Bay Resort
  • Pet policy: Pets are not permitted at Tranquility Bay Resort
  • Cancellation policies: cancellation is based on the time of year you are visiting the resort and the specific offer that you have booked. View our cancellation policies here


Please note that at certain times of the year, a prevailing north wind can bring seagrass to our beach. While we work hard to clean the beach regularly, it isn’t always possible to remove all the seagrass due to wind direction. Local restrictions prevent us from permanently removing seagrass from the water, and we are therefore required to place the grass into another location of the ocean.

Learn more about seagrass protection in the Florida Keys below or check out our blog, highlighting the importance of seagrass.

Please note: 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.