A beer crawl is a perfectly acceptable date
Here's the good news: Seattle has more breweries than anywhere (even Portland depending on how you add 'em up), and they make a for sweet/low-key date spots, so why not hit a few without leaving the same neighborhood.
Even with three million people in the metro, you’re lucky if there’s one degree of separation
Sure, the dating pool seems deep, but once you start sorting people based on age, education, interests, etc., it starts to look really shallow. Seattle is the smallest big city in the country, a place where everybody seems to know everybody, so don't be surprised if your date turns out to be your roommate's ex's little sister/brother.