I stayed for two nights in the middle of the week in the summer of 2019, in the lower campsites, near the river.

Generally, this is one of the nicer national park campsites I've stayed in.  I reserved a site near the river in the hope that I'd be able see/access the river from my site, but no dice: the campsite was separated from the river by thick brush and a steep incline, so to get to the river I had to do a little walking.

Even my campsite by the river was fairly private, but I've heard from friends that the sites up on the hill are more private, so I will probably try to stay there next time.

The highlight of my stay here were the hundreds of fireflies around my campsite in the evening...sure, I've seen lots of fireflies in my time, but never so many, it was pretty cool.  

Also, I don't understand why other reviewers have described this place as "hard to find".  Google maps took me right to it, no fuss at all.  The road leading to the campground is really nice.