Go for a different kind of coffee
Check out Slate Coffee, a small and naturally lit cafe just up the hill from Ballard's main drag. They serve deconstructed lattes in the kind of glass you might not be used to drinking coffee out of, but that should totally impress your date.
Rally with the girls
Watch the Rat City Roller Girls get down and dirty over roller derby at the Key Arena. Practically a Seattle right of passage, this "sport" can be a little hard to explain, so we recommend just going and watching heavily tattooed women throw themselves into each other until you get it.