What to see on campus visit

I am visiting Penn later this week and will be able to spend pretty much the whole day there. In addition to the campus tour and info session, what should I be sure to see/do while I’m there. I really want to get a sense for what the general campus/student vibe is, which I know is difficult to do on a college visit sometimes, especially when most of the students are home for the summer.

Any insight or advice on the matter is very much appreciated.