From the website:

Oileanra Seaweed Baths & Sauna nestled in an Archipelago in the scenic beauty of Leitir Mealláin in Co Galway. 

Discover the ultimate escape at Oileanra Sauna & Seaweed Baths, where nature creates a truly unforgettable experience. Rejuvenate. Relax. Rediscover.

Nestled in the heart of the scenic West of Ireland, Oileanra Sauna & Seaweed Baths offers a sanctuary of serenity and wellness. Our newly opened facility is designed to accommodate up to 10 guests, providing an intimate and personalized experience that rejuvenates your body, relaxes your mind, and restores your spirit.

A sauna session is 15 euro for an hour, which can be booked on the website.

Motorhome Parking

Overnight parking is allowed at a cost of 10 euro a night or 25 with electric. The website mentions the 25 euro option as being "full package" so unsure if it includes access to a sauna session or not for the price. You can book on the website.

No other services are mentioned on the website so if you know more please let us know with a comment.

There is a pub nearby and access to the sea for swimming in a shallow bay.