It is a risky move especially during holiday weekends. People book way ahead. Maybe try to get a pre paid credit/debit card and do it that way so you have a sure thing when you go. It is a great campsite! We go every year and always have a great time. Go with the pre paid card or call the day before. Good luck!
I would call the day before - I think it is very competitive especially on weekends. Most people book far in advance so showing up sounds to be risky to me.
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