The traditional scavenger hunt involves teams that fan out over a neighborhood looking for items on a list.
A coin values books ( like The red book: in the USA) Serves as the list. Go find a 100 coins, examine them, and the team with the highest values found wins. Coin shop or kids club would make a good sponsor.
Awfully easy to cheat, so would be good for youth group trying to teach cheating skills.-- popbottle, Jul 24 2013 This strangely reminds me of the entire UK economy.-- not_morrison_rm, Jul 25 2013 random, halfbakery