Inspired by the Great Escape thread...

http://www.urbanchallenge.com

This is essentially a scavenger hunt where you and a partner have five hours to find 12 checkpoints within a downtown city setting. The kicker is that you can have a "support team" that you can call to help you out with solving the clues leading to each checkpoint. You can also carry a GPS device and wireless internet device if you choose to.

Top 10 finishing teams in each city are invited to participate in the National Championship in Las Vegas.

Unfortunately, the Denver Challenge has already happened, but there are still some cities left. I figure it would be a fun 'DO' activity--should a DO coincide with this event...

This sounds like a lot of fun, and I'm definitely looking into doing this next year in Denver.

To anyone that enters, good luck!