Check in is after 12pm. During the week the office closes at 8, but Fri-Sat nights during peak season you can check in until 9 or 10pm. If you arrive after the office closes and you have a reservation, they’ll leave a map on the office door with your name to tell you which site to go to. You can register and pay first thing the next morning.
If I remember it's 2pm check in time.
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