We found this campsite through our Pacific Northwest Rough Guide and it was perfect. Great location, about 2miles up the road from Rialto Beach, set in amongst the trees (I think all the spots were shaded and tree covered), each campsite has its own picnic bench and campfire ring. They are all pretty spacious and each section has its own toilet block.
No showers - however if you are there for a longer stay the campsite up the road has coin operated showers you are able to use, in fact the ranger station has a list of about 4 sites you can visit to shower.
The campsite was lovely and quiet when we were there, I think they have 80+ sites but it does say it fills up quickly at peak times as its so nice, its in the National Park.
Overall can't wait to go back!! Good location too, about 11m outside of Forks which has pretty much all supplies you would need if you had to re-stock!!