Article: This will lessen their chances of getting lost. You could do boys vs. girls, sibling teams, etc. If there are younger and older kids/adults in the group, then it might be best to pair up younger kids with older kids/adults. Some good items might be stuffed animals, books, etc. Make sure that there is more than one of each item so that all the teams can get one.  Give each team a prize, with the winning team having the best prize.
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Make the scavenger hunt indoors, or in an enclosed area outside. Pair the kids up. Find items that are familiar and obvious. Hide the items in easy places. Create simple lists for each team. Announce the winning team once all the teams find all the items.