I love this state park, the landscape of glacial-carved coulees and sagebrush covered shrubsteppe is gorgeous and unique. The park is truly a geological wonder. As campgrounds go, this one is very windy! Keep that in mind if you are tent camping, as you could easily lose your tent!
If camping here I cannot suggest campsite 88 in campground D unless you are in an RV. It's just a very basic, gravel site with little shade, right by the road entering the campground, and not private at all. It is right across from a nice beach though so could be a good spot for an RV. Campsite 118 looked much better and I plan on choosing that site instead next time.
I do not suggest the Sun Lakes Resort campsite that is not managed by Washington State Parks unless you like being packed in like sardines. Camping at the state park managed campsite is far better.