Don't there without a reservation!

We arrived here on our round trip through California without a reservation and there was no one at the front desk. Since the host's place was not marked on the map and we could not find it, we looked through the reservations and picked an unassigned site. At the reception we left a message that we put our tent there and will pay the next morning. Early the next morning, we were rudely told off by a very unfriendly staff member and then asked to pay on the spot (cash only). He demanded 50$ instead of 35$. This was a very unpleasant experience and even if the campground otherwise was okay we would not go there again under any circumstances, as we consider such an unfriendly behavior very unprofessional and inappropriate.