Everyone thinks they are the most important
You have your groups, and other people have their groups. Everyone believes theirs is the most important: that's just human nature. I cannot name a single sorority or fraternity, but I'll bet they don't know what my groups are called either.
I am involved mainly in NSSLHA, which is the National Student Speech Language Hearing Association. We do volunteer activities, go to conferences for our profession, and do fundraiser activities. The advisors for NSSLHA are my teachers, and the officers and members are my classmates, so we're a pretty close group.
I met my closest friends actually taking physical education classes. I took social dance, self-defense, badmitton, and aerobic dance, all of which required a lot of communication between the people in the class, so we got to know each other pretty well.
I am not really big on the party scene. I don't smoke or drink or hang out with people who do. There are plenty of church groups both on and off campus. There are also two malls, three movie theatres, one of which is on campus- $2 a movie, and several stores and restaurants to go to.