Most graduate schools are interested in having you visit and interview with faculty and students. These interviews provide an opportunity for you to articulate your qualifications for and your interest in the program as well as giving you the chance to get a real feel for the school, faculty, and resources available, and to determine whether or not you will be happy there.
If you cannot for some reason schedule an interview, try to contact one or more students already in the program. They will be able to give you some first-hand information about what it is really like, in addition to what you read in the admissions materials.
Tips for the interview:
Web sites that may be helpful in preparing for your graduate school interviews
Interviewing in general:
Office of Career Development Interviewing Skills Information: /studentlife/src/career/services/interview_handout.asp
For graduate school:
http://www.careerservices.calpoly.edu/Students/Colleges/successful_
interviewing.htm
http://www.whitworth.edu/academic/Resources/Science/Shared%20Documents/PostgraduateOpportunities/Interviews/Index.htm
Specifically for medical school:
http://www.essayedge.com/medical/admissions/interview.shtml