After visiting the park many times, we finally camped there in July 2019.  Most of the sites were huge and level, and we were able to choose a mostly-shaded site with water and electric near the bathhouse.

Everyone we met (rangers, people in the visitor's center, etc.) was very helpful and friendly.  

We hoped to go tubing, but since the river was running high and fast, they weren't renting tubes, and we asked too late about renting a canoe or kayak.  (They do drop offs and pick ups at certain times and reservations are recommended.)

Cell service is extremely limited, but there's wi-fi available at the visitors center and we used that to check in with our pet sitter.

It was SO HOT when we were there and we really wished there was a designated "beach" area on the river (or in a perfect world, a pool).  Swimming is not advised due to rocks and drop-offs, but people were in the river, anyhow.

We'll definitely go again!

More pictures and information about our experience is on my blog:

http://www.art-rageous.net/artrageousblog/?p=4374