Once you enter the campground take the first right and follow the road around. It leads to some campsites that are more secluded than the main portion of the campground. Be aware that only two campgrounds in the park have running water and flush toilets. These are Black Rock and Cottonwood. Cottonwood is lower and hotter than any other campground.
BLack Rock is kind of boring.
If you don't stay at one of those, bring LOTS of water, especially if you're doing any hiking. Hope this helps.