Are these similar to a private hot spring - everyone can be naked? Is that the full name - The Spas? Are they merely private huts or part of a hotel-type complex? More info would be much appreciated.[/QUOTE]
Apologies- the Spas I visited are near Chiang Rai not Chiang Mai.
These Spas are (private) sulphur spring locations which have large common pools plus small private huts with bathing baths and showers. A small restaurant is often included. People go to "take the waters" and so did I but I also squeezed in other activities in the hut. The hotels have brochures with maps and will arrange a taxi etc.Great fun and in-expensive. Perhaps Chiang Mai has such places nearby also.