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Hi EJO,
Be sure to visit the Museum of Flight if it is not already on you list. Fascinating place. Harbor tours are available through Argosy Cruises. There is also a sailing vessel that does sight-seeing as well.
Visit the Center for Wooden Boats on south Lake Union. That part of town is pretty sketchy now, as it has been taken over by Google, Amazon, and other tech firms. Keep your eyes on your surroundings as you walk because no one else is:)

If you make it up to the San Juans I'd be happy to give you a boat tour.

Dennis