Rent, se the park ranger in the admin building.
You're not required to reserve but if you don't whoever pay for it have the right to ask your group to leave.
Technically you should and I recommend it for big groups, you don't wanna move 30 people around feom one shelter to another
Your soppose to rent them, if there is only a few of you I wouldn't worry about it. Bigger parties I would.
You can but I've never rented one.
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