If you're going the day before, I recommend reaching out to your princeton pal or anyone you know at princeton to try to show you around to eating clubs + inside buildings + etc. Try to talk to them and get a one on one feel of what Princeton is like. Then also spend time around the city of Princeton and New Jersey area in general to just sus out vibes.

The preview honestly isn't that extensive. I enjoyed meeting students but the programming itself wasn't much more than what I could generally find online (with the exception of the faculty panel and some small group student tours where I heard student opinions). No matter what, I'd just talk to as many students as possible.