For a great idea for a scavenger hunt...when completing the scavenger hunt you have planned,(have both teams end in the same place) have blank, new, white pillow cases for everyone. winners & losers. Enough for them all. Have fabric markers and let the group of friends decorate them together. Sign each others and write crazy and fun things all over them! This is an inexpensive thing that the group of friends will be able to use again and again!