I've discovered a group trip format that I really love, and I wanted to share it with others because (a) you might find it fun to host or join something like this in the future and (b) selfishly, I would like more people to organize trips like this so that I can join them! The basic idea simple: live in an interesting new place for a few days or weeks with friends in walking distance, as if we were neighbors. I pick a walkable neighborhood in...