I did this activity in team-building in the corporate world. Divide into teams. Everyone gets a carpet square (or we call them carpet rectangles at our house). They are on one side of a swamp and they have to get to the other side. They can cross by standing on their carpet square, like a stepping stone, but they have to be touching the carpet square at all times (with any body part) or the alligators will eat it (so you would take it away if you see any carpet square not being touched or stood on). The kids will soon figure out that the only way to get across is to work together - but let them figure that out if they can. If you don't have carpet squares, you could use cardboard. Just make sure they won't slide around too much and fall.
