Pike Place Market in Seattle is a pretty typical stop. Tons of little shops and good eateries. Even has a brewery in there so you could get some good northwest microbrewed deliciousness. If you're into sports, Safeco field is a great place to see a ballgame. It's a newer stadium with lots of amenities, and is highly thought of as a great family-friendly atmosphere. Unfortunately I don't spend enough time in Seattle to remember the specific names of restaurants, but in a city this size you'll always have many options. Plenty of fresh seafood, if that's your thing. The Seattle-area people in general are a pretty amicable crowd. Be sure to bring some rain gear, as we won't hit summer until July 5th. Weather has been decent temperature wise, but it's been pissing down steadily, and that's par for our springtimes.
For the food choices, what's your direction? Fancy sit-down, friendly local pub, good old steak and seafood? Shoot us a direction to work with, and I'll see if I can't dig up some recommendations for you.