Does the thought of running a mile terrify you? Think you'll never achieve a "runner's high"? Think again, and bust out a white tee for The Color Run. This untimed (read: noncompetitive) 5K through City Park is quite possibly the most fun you'll have on a race course—ever—thanks to the volunteers and staff who splatter you with paint powder (colored corn starch) at regular intervals, leaving you dyed like a snow cone. A portion of registration proceeds benefit Children's Hospital Colorado, so you can feel good and do good all in the same stride.