$20 a carload, bikes/walkers are less. Keep the receipt for reentry for 7 days. Free entry for active duty, retired, and vets on disability. Also free entry for 4th grade students and their family.
I think its 20$ but you get to use the pass for reentry for up to 1 week if I remember correctly.
No fees once in the park. You do have to purchase the pass that suits your stay!
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