Ain't much in actually in Seattle, typical cookie cutter tech city now. You would be hard pressed to find a Real Seattleite who was born and raised in the city.
Okay, enough of that.
I'd check out the other areas of the PNW. Traffic is horrible in Seattle, all days of the week except for early morning or late evenings. Try taking public transportation(Light Rail/Metro) or Lyft/Uber it if you plan to hit up Downtown, Waterfront, Capitol Hill, Queen Anne and the Lake Union area. When I take friends from out of town I generally take them to the more "touristy must try" spots:
-Paseos/Un Bien. Small hole-in-the-wall Caribbean joint. Always packed with long times. They have a few locations around the city. Fremont St near Wallingford(near UW) and 4th Ave near Centurylink and Safeco field. Try their Cuban roast or their tiger prawn sandwich.
-Chinatown/International District. Grimey area, used to house 40+tents of homeless and drug addicts under I-5 on King/Jackson. It's all cleaned up, for now. Some of the better eats if you want that international flavor. I would recommend Mike's Noodle House, try their wonton, siu gau noodle soup or their wonton/brisket noodle shop. Expect lines outside the door during the lunch rush. If you guys like dim sum go for Jade Garden or Harbor City Seafood. Again, long lines and wait times especially on the weekend. If you want Vietnamese, a popular spot on 12th AVE is Ba Bar. It is across the street from Seattle University, NE of Chinatown.
-Salumi's. Near the outskirts of Chinatown heading toward Pioneer Square. Owned by the parents of Mario Batali(Iron Chef if you watch Food Network) they specialize in Italian cured meats. Their hours are obscure, long lines during lunch but their sandwiches are on point. Only wish they would add more meat.
-Din Tai Fung. Two locations, one in Bellevue's Lincoln Square(another city across I90) and another at University Village by UW. Popular place for Taiwanese soup dumplings "shao long bao". Its chic and trendy.
-Walrus & The Carpenter. I come here for the oysters. Happy Hour oysters. Located in Ballard. You can hit up the locks(you might catch some late Kings/early Coho running through the fish ladder). Golden Gardens is a popular summer spot for bbq's and beach play.
-Toulouse Petit in Queen Anne, a popular French Creole spot near the Key Arena(where our beloved Super Sonics once played).
-Beecher's Cheese/Lowell's @ Pike Place. Beechers makes some good mac n' cheese, get a bowl to snack on and then head into Lowell's for a blackened salmon sandwich(I think King what they're using right now).
-Dicks Drive-In, famous burger joint in Seattle. Lots of locations so just use google to find one near you. Get the deluxe, fries, and a shake.
-Georgetown in South Seattle. Up and coming area in the Southend. Once known for outcasts and Seattle's grunge scene now has become a trendy spot with a mixture of tech nerds and hipsters. They do food truck Saturdays in the alley. Try Fonda la Carina or Brother's and Sister's Nashville Chicken. Pretty good. Bars like the 9lb Hammer or Star brass is just a walk away.
-Fancier eateries(require reservations if don't wanna wait): El Gaucho(steak), Canlis(oldest & best steak house in Seattle IMO), Any of the Tom Douglas joints(he's a "local" celeb chef) Lola's, Etta's, Serious Pie, Dahlia. John Howie's(Love their imported Wagyu beef but expect $200-$300/person), Palisades in Magnolia is a good romantic spot with a nice view of Elliot Bay with the Mrs.