603 Mason St
San Francisco, California 94129

Grab a magnifying glass and get down to the Warming Hut, near the fishing pier at the western end of Crissy Field. Once there, you'll find a booklet that directs you down the Mystery Trail in search of the first clue. There are nine secret plaques altogether, hidden along a one-mile waterfront trail-can you find them all? A prize awaits you if you can! Take the Crissy Field Mystery Trail Challenge, unlock its secrets and claim your surprise!

Added by Upcoming Robot on January 29, 2009