@boomerang,
I can't believe I forgot this - there is an aquarium right in Seattle - right on the water near the ferries.
They have one of those 3d movies too. We saw the Mt St Helens volcano erupt in there.
Its been a while since I've been - we have family in that area.
Oh there is a flight museum (of course with Boeing right there) - I think they have a flight simulator - not sure - haven't done that tour yet.
I did go to the Mt. Rainer brewery tour - the free samples were nice.