3 nights here. I agree with Eric Stoller's review except for one thing.... not every site is the same. The sites vary greatly as to whether there is a constructed tent pad, location of fire ring/picnic table, or the substrate. Some sites are completely flat and dirt while others are rocky and slanted a bit.
When booking zoom in on the pictures as much as you can to make sure you're getting a good spot. I had 2 locations during my 3 night stay and 1 was great but the other I had to exchange for a different site because it was too slanted for sleeping in my vehicle.
Also the sites are fairly close together, I'd recommend coming during the week when prices are cheaper and less crowded.