Laguna Mountain Campground at Paicines, Paicines, California.

We found it clean, and left it clean. I think only four spots available, so good luck. There is Sweetwater up the road, too. Careful, the road in the area is gravel, with some rocks and potholes. 14 day limit. Free. Fire pits. Nice view. Covered table with benches. Past the yellow gate, it's about an hour and a half hike to the waterfall (about 30 feet tall, with a small pool at the bottom). You should be in good shape for the hike (4 miles round trip). It's steep at times, and you'll have to climb through fallen trees, a shallow stream, mud. The only real fork is right before the waterfall. Go down. It's steep, but there's a rope to help you scale it. The map shows about the same distance to the waterfall from the Sweetwater campgrounds.