We camped in the motorhome area next to the resort and pools, not the state park further up the road. It was basically a gravel parking lot with hookups, but for what we needed, it was fine. Close to the lodge and pools and that part is nice. You should have a reservation during the peak summer months, but we have gotten in without one before. The hot tubs and pools are great!
The setting by the Icicle River is beautiful, and overall the park is well maintained although the restrooms could have been a bit cleaner. However, we have camped here 3 times, and each of those stays was ruined by the surly attitude of the park staff. By gum, don't step out of line or do ANYTHING wrong here or you will get a lecture as if you're 10 years old again and about to visit the woodshed. As someone else noted, I think this park is happy with their long-term guests and wish nothing to do with us overnighters. We were going to stay a second night but the rude, condescending attitude of the lady at the front desk chased us out (I think that was her intent!) Beware.