Stumptown Roasters on 12th Ave. It's one of the best coffee places in the city.
For hiking close to the city, you might want to check out Tiger Mountain:
http://www.ci.issaquah.wa.us/Page.asp?NavID=526. It is decent hiking for being so close to the city.
For nightlife, check out the Ballard neighborhood.
For sweets there are 2 of the most highly regarded places in the city a few blocks from each other. Trophy Cupcakes (
http://www.trophycupcakes.com/) and Molly Moon ice cream (
http://www.mollymoonicecream.com/) are on 45th St. If you go to Molly Moon, get the salted caramel ice cream. It's an either love it or hate it thing, but it's a death row, last thing on earth thing for me.