Places to eat:
Pho Bac - Chinatown - Best fucking Pho in the Western Hemisphere. Go yourself and call me a liar.
Musashi's - N. 45th Seattle - Chirashi
Serious Pie - I'll second that.
Mae Phim - Downtown Seattle, 94 Columbia St. Order the Shrimp Curry Noodle Soup (#27 iirc). Only go at lunch, and don't go to the wrong location.
Seattle Deli - Chinatown - Grilled pork Vietnamese Sandwich - go before 11:30 AM or forget it. Also, fight your way to the front, make eye contact, and call out your order. Otherwise the old ladies will just push you out of the way.
Hole in the Wall BBQ - Downtown - Real men like it hot and wet.
El Puerco Lloron - Downtown - Carne Asada y dos cervezas. Nap it off.
Things to do:
Hempfest Aug. 19-21
Bumbershoot Labor Day weekend
Naked Bike ride sometime in July, always fun to watch.
Long list of shit to do here
If you like the beach, Alkai is close by, but is crowded as hell on weekends, Pacific beaches are several hours away, but you can find a nice stretch to hang with friends w/o others around fairly easily.
If you end up on Capitol Hill, enjoy your twice daily dose of crawl across the I-405 bridge. Consider taking the M$FT shuttle if you can.