For his son's 11th birthday, redditor crujones43 set up a treasure hunt. The boy had to read maps, collect clues at various locations, use a compass, solve puzzles, and hike through the woods to find a box containing real money. The fun of getting there was worth even more! Thirty pictures of the adventure are posted, in case you want to try something similar. Link -via reddit
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My aunt did something similar one year for an easter egg hunt. Man we had to work for those eggs.