Leave Joshua Tree’s larger, more cramped campgrounds to the rock climbers who clamber here. With 39 sites scattered around towering boulders, Hidden Valley Campground is a removed alternative that’s perfect for rock scrambling. Each site is outfitted with a picnic table and a fire grate (bring your own wood). There are toilets but no showers or running water. Peak season is October through May; first come, first served.