2. The Bolder Boulder

The Buzz -- This ten-kilometer Memorial Day run draws more than 40,000 runners of all ages, skill levels, and abilities. At the sound of the start gun, disabled athletes take off in their low riding three-wheelers, followed by a very eclectic assortment of running enthusiasts. Don't be surprised to see Elvis or Abe Lincoln in running shoes, a sprinting belly dancer, or a jogging bride and groom in mid-vows.