The Great City Race, Atlanta

With a portion of the proceeds benefiting The Leukemia & Lymphoma Society, The Great City Race challenges city dwellers' problem-solving skills and knowledge of their hometown in a race that's both mentally and physically challenging. Crowds of colorfully dressed teams gather on the date of the race armed with a digital camera or cell phone to document each task that they perform. Using nothing but their feet, public transportation, and knowledge of the city, teams must solve 11 out of 12 clues and return to the starting line. The teams with the best times are rewarded for their efforts with prizes, and all participants go home with a T-shirt and swag bag to stow excess confidence.