Had a lot of fun at the Cosmic Run – the most disorganized 5K, I've ever participated in. Supposedly you run a course through LED light installations all the while being sprayed w/ powdered pigments whilst a dj is blasting heart-pounding, soul-crushing, mind-numbing (one of those) tunes. This was all around Candlestick Park, but the course was not readily apparent, so basically large throngs of people were criss-crossing the parking lot in herds, running from installation to installation. And is started 2 HOURS LATE. Somehow, still fun.