Name one thing you like doing for fun in Seattle

I am always being asked by people who are new to the city, or who are coming here on holidays, what is fun to do in Seattle.

If I'd be to pick one of my favorites, that will be to Ride the Ducks of Seattle. The guides/drivers are hilarious and give a great tour of the city. You can learn a lot about Seattle and the neighborhoods. The highlight of the trip is splashing down into Lake Union for a great look at the city skyline, the floating house from Sleepless in Seattle and some amazing floating homes and houseboats.
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That what my recommendation, what is yours?