Small, But with Plenty of Rainforest Solitude
Set far enough away from civilization this small frontcountry campground is well-hidden in the mature rainforest along the Quinault River. There are only about 10 spots but if you are looking to spend one night before going into the backcountry or want to make a basecamp for daily hikes this is a good option. I'm sure this place fills up in the summer so check the NPS website for more information as I don't think they take reservations!
All of the sites are pretty close to the main road through camp so unless you park your car in front of your camp you don't have a ton of privacy. Also the only facilities are port-a-potties at the end of the camp. There are much prettier spots if you are willing to hike up either the North Fork trail or Three Lakes trail.
I did see (two!) black bears on the road when I was out there so be pretty wary of where your leaving your food unless you want a visit from Yogi! Also rangers will make the rounds there at least once a day so if you are worried about being too far out do not worry. All in all a perfectly utilitarian spot away from the Quinault River in the woods!