Alot of students party on the weekends, and if you have a fake ID then you can go out to bars during the week.
Frats and sororities are pretty important, but personally, I would never pay for forced friendships.
Dance groups, and social awareness groups(such as TDC and Pangea, respectively) are also popular.
Most students are involved in at least one extracurricular activity.
Tufts students get highly intoxicated, take off all their clothes, an run laps around the campus quad.