dg1: I highly recommend the Boeing Tour up in Everett. They take you through the plant where 747s and 777s are built. Well worth the hour or so drive to Everett from downtown Seattle.
I had a great meal at Ivar's in Mukilteo before our afternoon tour of the plant. One of the best pieces of fish I've ever had, anywhere.
For more information, please see:
http://www.boeing.com/companyoffices.../tour2ops.html