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.