There is a Portland, Seattle, Vancouver thread that has some good info. It might be titled PNW.
Short version is Taco Chukis is pretty good; the skatepark next to all the Amazon offices downtown is fun, but small; and the Birdhouse is tasty choice for lunch; the Station is a good coffee shop. And, if you are going with a partner, The Shop by Porter has horrrrrible operating hours, but it is nice place to chill and chat over coffee. And, the crumpet place in the market is overpriced as all hell, but it is pretty tasty, even if the tea is hyper over steeped.