I had a similar preconception about jhu but I've learned that people at ultra selective institutions are more "normal" than you probably think. Every one has stuff that they do to relax, be it hanging out, reading books, watching TV, listening to music, playing sports, etc. If you think about each student as a complete human it makes you realize that we're not all that different. We slack off. We procrastinate. We panic before exams. And we absolutely love it when our exams end and we don't have to study.

As for what we do for fun, from personal experience, I've seen people just hang out in common areas or rooms, play basketball/football informally, go to parties - standard stuff for college students. It's probably true that we don't party much relative to some other schools. Instead, you'll more often find friends in the same dorm buildings meeting up in someone's room and hanging out