I'm a student at Gonzaga University and one of the clubs I'm in did a 1 night camping trip here at the end of September. There were 11 of us divided between 2 adjacent campsites.
Campsites had parking right at campsite. We took 3 cars and fit in the provided parking spots for our 2 campsites just fine. We were tent camping but there were other groups with trailers and even 5th wheels - they seemed to fit fine as well. Each campsite has 2 parking spots, a campfire with a grill to put over top, a picnic bench, and space for multiple tents.
The trails and sights away from the campsites are great too. The main hike starts with crossing over a suspension bridge (as a civil engineering major, I thought this was really cool and it felt and looked very sturdy based on my very novice assessment). There were a couple different trail options - lots of places to explore if you're staying for multiple days. The river was beautiful and powerful and could be seen at multiple points during a hike. There were interesting rock formations of varying sizes. Our group of college students enjoyed climbing up some of the small to medium sized formations. Resulted in some amazing views and fun pictures. Trails were easily identifiable and had enough room for people walking opposite directions to pass each other easily. Seemed like a good trail for families with children of all ages. Saw many dogs of all different breeds on the trail and at the campsite - they all seemed to be having a great time and were kept on leash per park rules. There were doggy waste bags available for use too.
I would absolutely go back. I had such a good time and this was a perfect escape into the wilderness for a weekend.