American's, its time to boast!

Seattle eh? Lots of people will certainly tell you that it rains and rains and rains. I'd have to say that's true, although there are times when the weather gets nice.

Be sure to check out Pike Place Market. Lots of shops, various attractions, and so on, especially the gum wall. The Space Needle is pretty cool too, but imo not as interesting. It is associated with sky views of the city, and marvelous firework shows. Then there's the Pacific Science Center. I haven't been there in a while, but it's got all sorts of cool gadgets for you to screw around with.

Pretty much this.
There are these "Ride The Ducks" tours, that can be pretty fun. They're tours around Seattle, but it's in this Car-Boat thing from WWII, so it's on land and water. And they give you little duck-quackers :3. Science Center is fun, I went there multiple times every year up until I was about 13, and had a blast every time. The Space Needle is the biggest known attraction around, but it isn't honestly great at all. Expensive, and fairly boring. Plus, if it's a cloudy day, you're screwed. Pike Place Market is cool, definitely a must, including the gum wall, like Kajiti said. If you take a picture and point out which piece of gum is mine, I'll give you $100.00.

I can't really think of anything else at the moment, but if I do, I'll let you know.