Bathhouse,
Gym, & Wellness Sanctuary
· Old San Juan, Puerto Rico ·
Every amenity designed
to work together.
One building.
One membership. Everything your body needs.
This is what's waiting for you inside.
Ancient ritual. Modern recovery.
A sensory experience built on community, connection, and care.
Biohacking, Recovery & Fitness in Puerto Rico
Las Ruinas offers one of the only complete thermal bathing experiences in Puerto Rico. Five distinct environments, each one doing something different to the body — designed to be used together.
The Gym
A full-facility boutique gym unlike anything else in Old San Juan. Technogym equipment, power racks, Smith machine, dumbbells, kettlebells, cable machines, medicine balls, treadmills, rower, elliptical, and bikes — all inside the same warm terracotta walls that define the rest of Las Ruinas.
Proper workout attire and shoes are required.
Complimentary
Tea Bar
The Las Ruinas tea bar is complimentary for all guests — hot tea, popsicles, and nuts, thoughtfully stocked and always available. A small, considered pause between the gym and the plunge, or the perfect way to close out your session before you head back into Old San Juan.
Dry Sauna
High heat, low humidity. The classic sauna experience — the one that has existed in some form in nearly every culture on earth. Fifteen minutes in here and the rest of the day feels different.
Infrared Sauna
Unlike a traditional dry sauna, infrared uses light to heat the body directly rather than the air around it. Lower ambient temperature, deeper tissue penetration. One of the few infrared saunas available in Old San Juan.
Steam Room
Warm, humid, and enveloping. The steam room operates at lower temperatures than the saunas — the most accessible entry point into thermal bathing and one of the best things you can do for your respiratory system.
Cold Plunge
The counterpart to everything above. One to three minutes in the cold plunge and your entire system resets. The clarity that follows isn't a feeling — it's chemistry. This is where the real recovery happens.
Thermal Pool
Where most guests find their rhythm. The thermal pool sits between the heat and the cold — a place to slow down, extend your session, and let the body integrate everything it just went through.
Salt Water Pool
Step in and feel the difference. The saltwater pool at Las Ruinas is designed for relaxation and balance — a gentle, restorative soak that rounds out the thermal bathing experience. Lower impact than the cold plunge, more intentional than a standard pool.
Locker Rooms, Showers &
Get Ready Stations
Private, clean, and fully equipped. Locking lockers, showers, and get-ready stations so you can arrive from wherever and leave ready for wherever you're going.
Towels are complimentary.
Smoothie Spa
The perfect cool-down after your session. Refreshing drinks to ease you back into the day.
Day passes and memberships available.
Full access to every amenity on this page — the gym, the thermal suite, the café, the tea bar, and everything in between.
Members enjoy exclusive early access from 6 AM to 8 AM daily.