Ah, layovers. I don't usually leave the airport when I'm stuck in a random city, but if you're feeling adventurous, here's a handy set of sketchbook maps that Oliver Jeffers draws for One City, Five Hours, a series in United Airlines' in-flight magazine. He claims they're "all geographically accurate", hee hee.
Seattle's map looks pretty good, although I honestly can't imagine tourning Pioneer Square, Showbox at the Market, the original Starbucks, the Elliott Bay Bookstore, Quinns Pub, Velouria, Palace Kitchen, the Experience Music Project, and the Space Needle, phew, in only 5 hours!
{Images via Hemispheres Magazine by Oliver Jeffers}