Was told on the phone to just pick a spot and pay on my way out in the morning since I arrived after office closed. Many spots to choose from in several separate loops. Heated bathrooms have very clean showers with hot water. Street lamps around site made me feel safe although I can see how people might find them annoying. You have to drive pretty far into the park to get to the sites but that seems to discourage locals from driving through randomly like I’ve seen in other places. I had 2 bars of Verizon service and was able to text and use data.