We decided to take a weekend trip to this hot springs for our maiden voyage in our new travel trailer. The site was exceptionally clean as well as all facilities, to include restrooms. The staff were eager to help and provide the history of the hot springs. There are few RV hookups, so if you choose to go reserve in advance as well as reserving slots for the pool or hot tub, they only allow 25 people on the pool for 1 1/2 hour increments so it's not cramped. I definitely recommend this place and will go again myself.
Roystone hot springs is the closest hot springs to where I live (it's between Emmett & Horseshoe Bend) so I had to check it out! I went with a church group so it was all paid for but normally a tent site is $10 and I'm not sure if it's an extra charge to use the pool. The hot springs pool was open air but has a roof (nice for the shade), made of concrete, and perfect temperature (it was a hot day but they keep the water probably a little cooler than body temperature if the weather is hot). As far as the camping, the amenities are nice but there is not much privacy (sites are all in one big open grassy area), and little to no shade. For that reason, I wouldn't recommend this spot in the heat of the summer. This is definitely a more commercial option as far as hot springs camping goes, which I'm not a huge fan of, but overall it's a well-kept place and I might do some camping there again in the fall. It is very conveniently located.