There are lots of places to camp here. I spent one night along Palm Canyon Road, where there were plenty of pull outs. There's also many spots up by Crystal Hill. Both places were easily accessible with a small car, just drive slow and be extra careful at rougher spots. There are signs that say "no camping beyond this point", but they are only referring to the land before you get the refuge. Once you enter the refuge you can camp just about anywhere. This is a very beautiful place, would highly recommend spending a night if you're in the area.