$20 for Detroit Challenge: The Ultimate Urban Scavenger Race on Sunday, September 16 from Challenge Nation ($50 Value)

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In a Nutshell

Teams race to solve clues and strategize to win cash prizes and awards during urban race; participants gulp drink specials at after party

The Fine Print

Expires Sep 16th, 2012. Limit 1 per person, may buy 10 additional as gifts. Limit 1 per visit. 1 Groupon required per participant. Must register online by 9/9/12. Subject to availability and weather. Must be 18 or older or be accompanied by teammate over 18. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

Scavenger hunts help people to get to know a city intimately, which may prove valuable when put in charge of hiding celebrity wax figures for the citywide celebrity-wax-figure hunt that takes place each Easter. Prepare for this venerable American tradition with this Groupon.

$20 for Entry to Urban Scavenger-Hunt Adventure Race on September 16 ($50 Value)

During the challenge, teams of two or more run helter-skelter around the city in a frantic race for cash prizes, personal pride, and entry into the national challenge, with a first-place award of $300 at stake. Not only do participants have to solve strands of interconnected clues, they need to plot spatiotemporal stratagems while exploring undiscovered corners of the city. Although being physically fit is a plus, quick wits and wise planning ultimately determine the winners. Participation in the challenge gets contestants a clue packet, race-number bib, and T-shirt, and fees go toward the prize pool. The website offers a regular FAQ, as well as a Groupon FAQ detailing the intricacies of the race, what to wear the day of, why it's not okay to bring a boa constrictor, and more.

After the race is through and winners are determined, all participants are invited to partake in an after party and awards ceremony. Challenge participants can partake in drink specials and music while additional prizes, such as best costume, are announced. Check the website for updates.

Challenge Nation

Challenge Nation pioneered the urban-adventure race with a race season that includes visits to 35 cities across the country. Each scavenger hunt is personalized to the hosting city, exploring its many diverse neighborhoods with a series of clues that would test even the most skilled children's-book detective. The teams—comprised of at least two people—vie for a $300 first-place prize. The _Amazing Race_–style competition rewards quick wits and wise planning over physical fitness, so the best way to prepare is by doing logic puzzles while eating Funyuns and lounging in a La-Z-Boy. The top five teams receive entry to compete in the national championship, which rewards winning teams with a $5,000 cash prize.

Outdoor activities, from cycling to sailing