Colorado
Mountain Air Ranch SW of Denver, CO
Dakota Hot Springs South of Penrose, CO and a mile west on Hwy 50
Valley View Hot Springs (Part of the Orient Land Trust) near Villa Grove, CO
Desert Reef Hot Springs near Florence, CO (Pretty anal about single males)
Indian Hot Springs West of Denver (Gender segregated thermal caves, private baths)
Beyond that, there are many unofficial opportunities up in the mountains on remote trails.
Boulder Canyon is pretty popular, mostly with the gay crowd.
Edited to correct the link to OLT (Valley View Hot Springs)
John aka cobeachbum
We actually like Desert Reef quite a bit. It's in a very sparse location, quiet and well-maintained. As another person commented, they are a bit anal about single males, but you can remedy that with a membership or a female friend. It is clothing-optional, as most locations in Colorado are. When we go, we've noticed that about half or better of the visitors get naked. The other half, miss out.



