I agree with @skieurope, unless you have received a likely letter, you haven’t been accepted anywhere and you may find that the decision may actually be made for you.
Actually, while Dartmouth does have a large greek presence, you do not have to be part of the greek system to attend their events as they are open to all students. If you are not into greek life or not into drinking, you will still find your people as here are plenty of people on campus who do not drink (my D was one and did not lack for anything to do). If you think there is no drinking at Penn or Columbia, think again (maybe more so because there are more ways to get alcohol).
However, we are from NYC, so she did not want her whole educational experience to take place on the island of Manhattan and spent many years on Penn’s campus. She was ready for something different because she knew she would return to NYC.
The Dartmouth Hitchcock medical center is in close proximity to campus, so you would not be at a loss for internships and shadowing. The flexibility of the D plan will allow you time off for internships, studying for the MCAT without interrupting your graduation plan. Dr. Witter, who is used to be head of pre-med advising but is still the faculty advisor for the Nathan Smith Pre-Med society is amazing (while D is not a doctor, she has a lot of close friends from her class who are but she did take a class with Witter). The alumni are always willing to help you in mentoring or securing an internship
Dartmouth is a place where professors invite you to dinner and there is funding if you want to take a professor to lunch. It really is a close knit community and when you hear people say that they bleed green, it is absolutely true.