Almost always outside.

To me, it frequently gives me reasons to go explore lots of new places/parks/etc. And I treat it as “hiking with a goal” (although definitely not everyone does it that way). And I’ve found a lot of really interesting/cool geocaches that way.

Also will do with my wife, family, friends, or solo. And have made friends that way. There’s ever regular meetups all over for the hobby.

There tend to be a lot of geocaches hidden in places like parking lots and things to but I have less than zero interest in that. It has to be somewhere that I would enjoy going to in the first place.

One was hidden in a book in a public library once (with the blessing of the library), which was pretty cool. Another I had to open a lock after solving a puzzle. Another was in a tree and you had to do something special to lower it down (which was super cool). Most I go to are just hidden in a nice place, though.