We got to the camp ground late (and it was pouring rain!) and we let them know way in advance we'll be arriving late, they said it was fine and they'll be expecting us. We even called them multiple times when we got to the gate, but nobody picked up. So we decided to drive in quickly after another car went in as that seemed to be the only way (fyi if anyone deals with the same problem). Staff was okay, we tried to find drinking water, which seemed to be more of a hurdle than it should be. But after all it was fine for a night. There's (apparently) a nice waterfall on the side of the park.