when i was a child, we did something that could work.

our school put on a skavenger hunt to search for our food. we got clues, and each clue led to an area where we'd find an item of our dinner.. so a sandwich, a packet of crisps, an apple, that kind of thing.. and after we found it all, we went back to eat it what we'd got.

of course if you did that you'd have to buy enough stuff for everyone, so everyone gets the same items and the same chance at the game (no unfair advantage)

you could hunt for various candies- gummy worms, fruit jellies, that kind of thing

you could make a list of stuff around the area, give each person a copy of the list and ask them to tick off the stuff when they find it (which is good because the stuff could be anywhere)

you could, if you were feeling creative, set up a murder mystery- and ask people to hunt for clues to who did the murder (of course it's not a real murder, but you get my drift)

how this one could also work is people finding out stuff about others-

so 1 of the clues would be for example.. someone over the age of 25, and people have to narrow it down

just some suggestions