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I know there are some primitive sites along the mt loop highway outside of granite falls. been a few years since I've been there. they are right along the road....
I have a neighbor who goes to Deception Pass state park every year. They seem to have a good time. Never actually camped there so I can't vouch for the noise level... http://www.parks.wa.gov/parks/?selectedpark=deception%20pass&subject=all