If the main family campground isn't your cup of tea, there are a couple of "environmental" sites available. Follow Castle Creek Road into the park, and instead of turning right into the campground hang toward the left and continue on Castle Creek Road (about a mile) until you see a flume on the right hand side, with three campsites behind it. Each site has a picnic table and food box, and a poorly maintained vault toilet. When I was last there in 2005, I believe it was $5 a night per site. This site is worth looking for... it's much quieter and seems miles away from the front of the park.