Online Reservation

Welcome to Marathon

Learn More About Our Florida Keys Resort

World Class Luxury

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

  • $30 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
  • Please note: 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
  • Please note room occupancy limits when booking - children are counted as one person in the booking party, regardless of age
  • Only guest vehicles can be parked in the hotel's parking lots. Trailers, jet skis, boats, and RV's are not allowed on the property. Off property parking will need to be arranged prior to arrival
  • 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

Beach

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 isn’t always possible to remove all 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.

Learn more about sea grass protection in the Florida Keys below.

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.