Clubs/organizations: I personally am not overly involved in student clubs on campus (We call them "RSOs" for Registered Student Organizations) but this mainly has to do with my personality type. (Not especially a "joiner".) However, I still feel very involved with campus, because most campus events are open to everyone and organizations are always welcoming new members. Especially popular groups on campus are University Theater, Women in Business, Peer Health Exchange, Model UN, just to name a few. (THERE ARE A TON.) This is one of the things I love about Chicago, if you want to join a club, they are always there, but there is no pressure if they are not really your thing.
Dorm Life: Dorms sort of develop their own personalities. The college is divided into houses...your house (think Harry Potter...) consists of the people you live and eat with. You can be as involved or uninvolved with house activities as you want. We have house tables in the dining halls so you almost never have to sit alone. Your house sponsors trips and activities such as going out to dinner, going to see shows, and movie nights, so if you are kind of shy at making your friends on your own this is a good way to get to know people. It depends on the night as to whether or not doors are open or closed or if people are being rowdy or quiet. (Most of the time pretty quiet...) Everyone feels very safe leaving their doors unlocked, and it is not unusual to have a random techno-music study break in the hall at 2:00 in the morning.
Dating/Social Scene: I think that the dating is pretty typical of any college campus. There are people who date exclusively, there are people who hook up casually, there are people that are seemingly asexual. People party Friday and Saturday nights (this is probably my biggest complaint about the school....It would be nice to have the option of going out more than one or two nights a week, but oh well) Parties are usually held at the frat houses or apartments around campus...word generally travels by mouth. Most of the frats charge a $5 cover to cover alcohol costs, which I found unusual, but apparently it is to make up for the low dues of being a member here. I know a lot of people involved in Greek life, though I think that is the nature of being someone who likes to go out a fair amount, because officially only somewhere around 10% of the student body is affiliated. I am not personally, but my best friend is, and they are generally very welcoming at the parties.
When we go off campus pretty much we eat, eat, eat. There is SO much good food in Chicago and so many diverse neighborhoods. The dining halls close at 2:30 on Saturdays, so we usually use that as a day to go out and explore the city and have dinner. We also hit up museums and shows....though it takes at least an hour to get anywhere on public transportation so sometimes laziness gets the best of us.
Overall, the social life is what you want it to be, but there is no way to get around how much studying is necessary at this school. That being said, I have found some of the best friends in the world here, so even when I'm in the library in the middle of the night working on a terrible paper it is hard to be miserable.