GENERAL ADVICE: prospective students visit / interviews

[/sigh/twombly]

I have my first prospective students visit/interview weekend coming up in March, and was wondering if anyone who has already been on one of these visits has any advice to share. I know these can differ from school to school, but I thought having a thread for general advice on this topic could be useful for a lot of people

What should I expect? How should I prepare? Is there anything you wish someone had told you before you did your first visit/interview weekend? 

Much appreciated! 

[Nmoyers]

How did it go?