I've been wandering around south Puget Sound for the last week. Lots to see!
Lots of State Parks (like McMicken Island, Joemma, Eagle Island, etc) offer privacy, hiking, and so forth. They're just about deserted this time of year, especially mid week.
Tacoma really surpassed me as a destination. Dock Street Marina is fantastic and it's very close to the Glass Museum, Washington State History Museum, and LeMay Car Museum.
Swantown Marina in Olympia is fantastic. The capitol is nearby.
Boston Harbor Marina and Lakebay Marina are other favorites. Both have enthusiastic new owners. They're small and a bit rustic, but quaint and unpretentious. They remind me a bit of places in the Broughtons.
Cruising this time of year can be great, but you'll miss the social side of things. There simply aren't many other cruisers!