I occasionally go in without reservations if I know ahead of time there are open sites. They still charged me the $9 fee. If you cancel and don't give advance notice you pay the $9 PLUS one night camping fee. My brother passed away unexpectedly the day before I was to leave on a camping trip. The total of the cancelation fees was almost half of what the reservation was. I had a friend on the site next to the one I had. He told me someone else took the site. So the campground got double fee for one night.