[OPhiAGinger]

When you enter a national park, have you ever seen a sign that says "Take nothing but photographs; leave nothing but footprints"? You can apply that same idea to a scavenger hunt.

Instead of making a list of things that the teams must bring back, you should arm each group with a digital camera and make a list of pictures they must take of each other at different places or doing different things. Ideas: washing a car, shaking hands with the university president (clear it ahead of time), carrying grocery bags for someone else at the grocery store, at the campus library, etc. Make the list long and spread out and the time limit tight so they couldn't possibly do them all. At the finish line, have an official "referee" count up how many of the photos each group snapped (either by downloading them onto a central computer or just by flipping through the memory on each camera) and declare a winner.

That way, you don't run the risk of someone taking something they shouldn't. Plus, you get some great photos for your scrapbook or website!