Originally posted by: PrinceofWands
Hit the library...it's rather...unique. Check out the Experience Music Project. Freeway Park is somewhat interesting architecture. The Museum of Flight is ok, though I prefer the Evergreen for aero stuff. Pike Place, of course. Woodland Park Zoo, if you're into zoos. Head over to Fremont for a fun, if step heavy, area of the city. If you want to see older areas of the metroplex (and architecture) you can go up to Everett, or over to Bremerton (also get some Navy stuff there). There's always the underground (though I think it's overrated). There are a ton of museums, especially art museums (though I prefer the Sci-Fi museum, being a bit of a geek). If you're unbearably yuppy you can check out the first Starbucks.
That should keep you for a while.