The museum cost money
Park is free, museum Admission: $2.00 for adults, $1.00 for children. Group rates available.
It is free to get in the only that cost is the museum.
I am 100% sure I paid $5.00 per each adult to tour the museum 2 1/2 months ago!
Nothing but if you want a park employee or docent to take you on a guided tour, that costs. How much, determined by how detailed you want the presentation to be. But to just get in to the park, free.
Nothing at all. The entire location is free
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