Backcountry permit required, not free but I forget the cost. Absolutely amazing park but some of the drop-offs are a little scary...don’t drink alcohol & camp here. There are about a dozen backcountry sites to choose from, I think all of them qualify as backpacking to get to the sites (more than a mile) though the trails aren’t very difficult and are easy to follow. Since it’s backcountry you have to bring water purification methods (or your own water) and don’t expect bathrooms or cell service. Worth getting sand in everything to stay here. Camping on the bluffs is like nothing else, highly recommended!