One of my favorite places to visit is Port Townsend - really turning into a great place - nice restaurants, pubs. We've stayed at the Old Palace Hotel which was a former brothel! i.e. Miss Amy's Room!
Also, more recently last month at Fort Flagler in a historical house which is part of an old army fort complete with concrete gun emplacements - fun to explore. Near Port Townsend is Fort Worden, again with lots of bunkers, forts, aand historical buildings - made famous as the location for An Offficer and a Gentleman - young Richard Gere.
Lots of fun places to visit in Seattle - Pike Market, Safeco Field (Mariners) - agree on the drive to Mt St Helens - if it's cloudy you won't see much - Today it's 90'F in Portland, and all the mountains are beautiful.