There are several organizations in school. I am involved in the Santa Clara Review, which is the Santa Clara University literary magazine. We take submissions from students (and the entire country - occasionally, we even get an international submission!) and create a booklet from them of ones that we think students will enjoy the most. I participated in the literary magazine at my high school and loved it, so I figured I would continue in college. Of course, SCU's is much more sophisticated and organized. There are several leader positions available, I am hoping to be a poetry editor next year!
It is impossible to walk around a floor of Loyola (my RLC) without seeing an open door! Students are always welcoming to others walking in and hanging out.
The athletic events are fairly popular too. I am going to a game next weekend! I'm very excited about it. Although we do not have a football team, there is definitely still school spirit.
We had a great guest speaker this year - Kip Fulbeck. I went to go see him speak and was amazed. Through the classics department, I also saw a lecture done on Gilgamesh which was very interesting. There are many lectures always going on.
I swear it feels like every weekend there is a theater or music event! For Valentines, the A Cappella groups were available for hire to sing to any one! And this weekend I saw the Opera - Marriage of Figaro - show put on by students. Next weekend, I will be attending the orchestra concert! There are several options for theatrical activities.
The fraternities and sororities are not recognized by the school, but there are definitely fraternities and sororities. You do not need to be in one or the other to have a social life. In fact, most people are not in them. If you are interested in them, they are there (that is sort of the general view on campus).