Our route from Port Townsend to Seattle was influenced by having booked to go on the Boeing factory tour, at Everett, north of the city. So we got a ferry from PT to Keystone on Whidbey Island, drove down to the south of the Island, and got another ferry from Clinton to Mukilteo. The Boeing factory is just a couple of miles from the ferry.
On the tour, we were taken to the assembly building (which is the biggest building in the world by volume), where they put together 747s, 767s, and 777s. The very first 787 Dreamliner was also there; they only started work on it this week. Cameras aren't allowed inside, so no photos.
In Seattle, it was raining but we decided to go up the Space Needle anyway. The observation deck is 520 feet up, and the lift (up the ouside) takes 41 seconds. There were great views of the city, Puget Sound, and Union Lake, but the visibility wasn't good enough to be able to see the mountains.
We have returned the car, having driven 1332 miles.