With more than 36,000 acres of recreational space around Boulder, you're more likely to meet someone rock climbing than bar hopping. Join any number of hiking, biking or climbing clubs to explore the nearby national forests and state parks. Or take your pick from more than 60 parks in the city alone.
After a day in the great outdoors, head down to the Pearl Street pedestrian mall for a little shopping and then get to know someone over a couple cold ones at the Boulder Beer Company. Colorado's first microbrewery, it's been helping people meet since 1979.