My husband and I love this State Park. It was definitely a good, long drive to get to, but was so worth it (about 5 or so hours from Walla Walla). The campsite was close to showers and water, and not too close to others. Both tent and RV camping is allowed. The hiking trail was long and absolutely amazing, and we ended up near a fire cabin used during the winter and summer. There was a night where coyotes came very close to the campground, and the rangers took care to ensure they didn't get too close. Everyone we came into contact with was friendly and helpful. We saw so much wildlife since it's located far away from cities and people. So worth it!
So, I should start by saying that we didn't end up camping here, as it's a first-come, first-serve camping site. It was about a two hour drive from Walla Walla, and we didn't get there in time to find an open camp site. We did drive around the entire camp site and walk around, and it was beautiful. Suitable for both RV and tent camping. I'd just like to warn potential campers that the GPS gave us the wrong directions and took us on this very backwoods road that was pretty much not a road and the side of a mountain. There is a real road going to this campsite!
My husband and I love this campground. It's close to the mountains without being too far away - about an hour and a half from us living in Tri-cities. There are showers and water spickets, room for horses, and great hiking trails. There is room for both tent and RV camping. We have only ever gone tent camping, and the size of the campgrounds for us has been great. There is room to set up hammocks and chairs.
The only unfortunate aspect about this campground is that it is somewhat close to the highway. After the first weekend we spent there, we got somewhat used to the sound - it can sometimes be soothing. It's also a good idea to bring something to provide added shade to either the tenting area or sitting area as it gets quite sunny in the morning.