There's Birch Bay State Park for camping:
http://www.parks.wa.gov/parks/?selectedpark=Birch%20Bay

As you head toward Birch Bay from I-5, after you cross the old highway, on the north is the old Forest Grove Ball Room. In about 1974 Commander Cody and his Lost Planet Airmen played there. My wife and I went with 6 friends. BYOWhatever. Every hippy from 3 counties & BC was there. Smoke 4 feet off the floor ( I didn't inhale) and the Commander pounding the keys, rocking the house for about 4 hours. Great time.
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"I didn't care what she didn't 'low--I would boogie-woogie anyhow" John Lee Hooker