Looking for a fun but unusual and somewhat boundary-pushing activity to do with a small group of friends that requires almost no preparation? I made a little collaborative scavenger hunt designed to be done in any city. I completed it recently with friends, and it went well! Depending on the city, it may be more difficult or less difficult, but we did it in Manhattan. It's designed so that no on-the-ground preparation is needed (i.e., the city itself provides the scavenger hunt for you)! Her...