When I introduced the nephews, 5 and 7 then, I deliberately chose one that was described as hidden for kids to trade in. Plus it was in a nice park where even if we hadn't found the cache, we had fun hiking through the woods and fording the creek and following the gps too soon bushwhacking off trail, getting caught in the rain, racing back to the car, running into friends, etc. Now they've found more than we have. Often, they play in playgrounds while mom, dad, aunt, etc. look for the stupid little magnetic nano stuffed in a tiny crevice somewhere. Sometimes, they get a babysitter and the grown-ups go out hunting.