There are 3 I think in the area. They are not big ones, but the one to the south requires reservations, the other to the north I dont know. We stayed at the one in town, has little to offer other than a parking area with hookups along the main street. We would stay there again and may if we go back. The owner also had the mexican restaurant in town and grows her own vegetables at the rv park. Its all fenced in to keep deer out!
The hot springs run by the state are free (30 min) time limit however. The commercial one across the street you can stay all day with a come go pass. Not much sight seeing in the area just a good place to stop and rest for a couple of days. There is/was a small buffalo herd just outside of town, nothing spectacular.