Going on a cruise is my guess.......
The usual disclaimers are:
Seattle is a shithole, why would you go there?
Watch out for shit and piss on the sidewalks, and the homeless/panhandlers everywhere
Pack a gun if you can, but guessing on your itinerary, that won't be possible.
The usual touristy spots if you are so inclined:
Pike Place Market
Space Needle
Ballard Locks & Fisherman's Terminal (probably have to take a car/lyft/uber to get there)
Museum of Flight (probably have to take a car/lyft/uber to get there)
Seattle waterfront (Great Wheel, Wings over Washington, etc.)
CHIHULY GARDEN AND GLASS