Everything! They bend over backwards for you. They put you up for free in their dorm, throw a pizza party for you the night before, serve a fancy lunch buffet, and make sure it's as low stress as possible.
What impressed you negatively?
The tour was an hour and a half long, very unnecessary
What did you wish you had known ahead of time?
Wear comfortable shoes!
What are your general comments?
The day starts with a talk on financial aid and the admissions process. Then I had my interview with one of the deans, followed by a very LONG tour given by a fourth year, and then lunch with third and fourth years. The day was organized really well and very low stress.