A city is a place of tremendous variety, usually constructed upon rock 'n' roll. Plumb the secret depths of Dallas with today's Groupon: for $45, you get admission for a team of two to the Urban Dare Adventure Race (a $90 value), held on May 7 starting at noon. The race kicks off from the Ginger Man Pub at 2718 Boll Street.

Urban Dare Adventure Race is a fast-paced competition that challenges two-person teams to decipher clues, navigate the city, and perform playful stunts. Combining the fast pace of a track meet with the brain-taxing sleuth work of a luge competition, the race uses a dozen trivia-based clues to lead contestants to checkpoints all over Dallas. Location hunters reach their checkpoints by whatever means necessary, whether it means sword fighting other teams atop speeding DART trains, cycling madly through a network of secret bike lanes, or taming a feral griffin. At the checkpoints, racers must use a camera to document their presence or, in some cases, get their passports stamped after completing a challenge. Races generally last less than four hours, and the winning team will receive a free entry to the Super Dare, which has a $5,000 grand prize that allows winners to dare each other to invest in a low-risk mutual fund. Proceeds from the race are used to help battle breast cancer.