Racial: Even though we're considered ethnic (read black) everywhere else there's a lot of light skinned people on the island that look down upon darker skinned individuals. It's ridiculous but racism does exist and it is shown through condescending words that make-up our daily vocabulary, crazy beauty routines and ambitions to be considered an American (read white person with "good hair"). Fortunately, the tolerance level is raised a little bit in our school because of the great education, the travelling opportunities and the amount of foreigners that decide to study (at least for a semester) in our school.
Religious: Even though there are exceptions, I find that people tend to divide themselves into two groups: Atheists/Agnostics vs. Christians. . There's constant tension between these two groups in my school. Unfortunately, there's not much discussion about Islam, Jewish or other religious traditions outside from some classes.
LGTB: I'm proud to say that there's a lot of members of the LGBT community in our school and they're widely accepted (not the same scenario outside of school). Nonetheless, I feel there are levels of acceptance: gay guys and bisexuals being the most accepted, still some awkwardness around lesbians and a real discomfort towards transgendered people (from some people).
Socio-economic: Even though the poor and the rich coexist in our campus, I still notice some divisions between the different groups and I don't feel they don't interact as much socially or outside of class.
I feel freshmen in general are the most left out. Slowly but surely you will find someone that share your interests and you'll have people to hang out with and that don't judge you.
The attire varies by field of study. The future businessmen and doctors always dress sharp. The philosophers and future college lit professors tend to dress hippie-ish. Then there's the people that just wear jeans and a tank top/hoodie..or pajamas. The usual...
You will typically interact with people you take classes with but also you meet a lot people through old friends from high school and you start developing bonds with people from other areas of study.
If I had to choose four type of students in our school I would say: the stressed-out-I-have-no-social-life science people, the vegetarian-i-ride a bike to school, zen people, the assertive and always-on-the-go business students and the hipster/artsy people from the Humanities/Communications area.
Most of the regular students here are Puerto Ricans from the most urbanized areas. Nonetheless we get our fair amount of exchange students or grad students and the Faculty is very multicultural.
The most prevalent financial background is middle-class (lower to upper)
Yes, a lot of the students are politically aware (and active) and they express it on campus, through blogs, Facebook, etc.
Even though I personally have more centrist views, I have to admit that there's left-wing bias in my campus. Very problematic because our governor is a conservative (he supports the Republican party) and the students are almost always against of his decisions.
Aside from future doctors and entrepreneurs that occasionally talk about how much money they'll earn, people tend to have a more purist view on knowledge and prefer to leave the money talk out of it.