It is important to look your best; you are applying to a professional program. Focus on having clean shoes, haircut, and a dark appropriately sized suit. Also, don't chew gum; its distracting.
Every school does pretty much the same thing -> you will see the classrooms; anatomy room; other areas. The only thing I would pay attention to is the dinning facilities (you want to have a nice place for lunch/dinner because you will be spending many hours in the building).
Useful questions to ask: Where do students live? How much is rent? What is the daily schedule like? What holidays do you have off?