I am also surprised by the inclusion of Tulane on your list. They are among the few colleges with mandatory community service, they hold an enormous “Crawfish Festival” annually, and most students are drawn to Tulane because of its location in NOLA, in my experience. I’m sure there are a few who never leave campus, but I suspect many, many more venture out to the Vieux Carre and Frenchman Street every weekend. University of Chicago is a little different, because Hyde Park is some distance from other parts of Chicago, and involves traveling through some sketchy neighborhoods, so I wouldn’t be surprised to learn that students remain near campus a lot. It’s a very vibrant, multicultural neighborhood, however, so I really don’t see it as much of a bubble.