Has to be reserved if you are going to use the barbeque or picnic tables but other than that no reservation(try the hike)
How do I make a reservation?
Always call for reservations
The above answer is correct that you ought to have a reservation if you're going to use one of the barbecue pits are picnic tables just to make sure that the park's not already reserves but reservations are not required.
You can go to the park and the museum without a reservation but if you want to use one of the bbq pits or picnic tables you should have a reservation.
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