Wear a cute pinwheel hat with helicopter blades on it, or you could just dress appropriately, ask intelligent questions and seem interested in the school. Although it is a nice opportunity to meet the faculty, see the facilities and gather pertinent information about the school and what they are looking for in a student, the school won't be keeping files for the most desirable future applicants. However, if you tell us what school it is then I am sure someone on here will be able to give some more specific advice or possibly even a question or two to ask that would make you look like you really did your homework.
