You name it, we got it! Northwestern is brimming with students groups,teams,and organizations. There is a lot of opportunity to get involved with a capella groups, on campus publications, and clubs. Also people are very receptive to new groups, if you don't find what you want.
Greek life is very big on campus, but some believe the administration want to eradicate the Greek scene altogether from NU in 10 years or so (but that is a rumor!). Being in a frat or sorority is a lot of fun and I assure you, it is nothing like Animal House here. There are always fun events but they are not intimidating! You have to remember that these are all Northwestern students. There isn't weird hazing or anything here.
The dating scene at Northwestern is notoriously bad. People complain that it is either hooking up or serious relationships... nothing in-between. I think, though, that this is the deal wherever you go -not just NU.
I have made the best friends here! Everyone is so encouraging and understands where you are coming from. Doors are usually open if people are at home and some of my favorite memories are just hanging out in other peoples' rooms.
People usually party 2-3 nights a week. Monday, Thursday, Friday, and Saturday are usually big nights to go out. A typical weekend is dinner out with friends, go out to a party later that Friday night, go to downtown Chicago during the next day, see a play on campus that night and maybe go out afterward, and brunch + a couple of hours in the library on Sunday when you tell each other your weekend stories.
If you don't drink, you can always go to a play or performance, do downtown Chicago, catch a movie, or just hang out with friends.