I stayed at this campground during a visit from the east coast, and I have to say it's hands down one of the finest places I've ever stayed. My cousin and I stayed two nights and used Marble Creek as a jumping off point for a couple of day hikes that I'd absolutely recommend (assuming no wild fires to impact visibility and a healthy appetite for switchbacks). If you stay here and you haven't considered it already, take look at hiking Hidden Lake or Cascade Pass. 

Now, for the campground. I stayed at site 003, which had direct access to Marble Creek. I spent one morning just sitting in the creek (which was still cold in August) sipping a local brew. The site was flat with a tent pad, fire ring, picnic table, and parking space to accommodate an F-150 King Ranch edition. Located further down the road from our site was a vault toilet (very clean, and not close enough to smell) and dumpsters for trash. I'd also note that I typically avoid campgrounds because I don't enjoy a lot of noise. It was pretty quiet here and there seemed to be a decent amount of space between each site.

Of note, and this might impact how others feel about the campground, but there's no potable water on site (bring your own). We saw plenty of fire wood for sale on the side of the road on the way in.