Seattle tips: The island is Tillicum Village on Blake island for the salmon dinner, but it is a 1/2-day excursion. Another fun thing in Seattle is to ride the ducks. It's a fun ride and takes you into Lake Washington, where you'll be able to see the "Sleepless in Seattle" houseboat. The underground tour is also fun. Of course, as everyone said Pike Place is a must. It also the site of the first Starbucks (if you drink coffee).
All the descriptions of Oregon make me want to go.
Wherever you go, Enjoy yourself. :)