It's an idaho state park. Currently $5. Plus Native American center is more depending on party size and age i believe.
5$ for parking, 10 for the museum fee.
It's 5 or ten per car for the grounds and bldgs, and another fee, about the same for the museum if you want to do that. The museum is native American stuff, not directly about the mission
Like $10 a car or something similar. Not expensive
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