Open Question: Games to play in the woods whilst camping *for adults*?

I am going camping with a group of friends (all 20-somethings) & am looking for some fun games & challenges. We're camping in the woods, on a Ray Mear's style weekend. I figured I could split the 7 of us into groups (with me as the judge) & see who can start a fire first/who can boil water the quickest. I also figured I could do an adult version of an Easter hunt (not sure how to make it more adult yet but...). Any other ideas?

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