Hot Springs State Park has three bath houses at the park. Two are private facilities (Star Plunge and Hellies) and there is the State Bath House. The State Bath House is free but you are limited to a 20 minute soak and then you can’t come back for 2 hours.
When you arrive, you sign in and write the time that you arrived. They have a nice locker room with showers. Then you exit the locker room into the indoor hot spring pool area:
I’m sure in the winter this indoor pool is much more popular!
Since we are here in the summer we decided we wanted to soak outside. The pools are kept at 104 degrees but it still felt great despite the summer heat. The pools are small but they were never crowded when we visited. The private pool facilities over at Hellies and Star Plunge are much bigger and have lots of slides for the kids to enjoy. The State Bath House has more of a therapeutic soaking vibe.
The mineral water is milky and almost felt thick!