Partying is big--people lovvvve their parties here. Sororities and fraternities are constantly having some party or another, and people are always having house parties. It was kind of overwhelming at first; I did not come to school a partier and really have not turned into a "partier," but I definitely enjoy going out. This isn't New York City, so don't expect a really hot club scene, but there are a good number of places, and people have their favorites. Some of the bars are 21 and up, so that kind of sucks for the younger crowd, but there are still a good number of places for them. Brick Street, Stadium, Pachinko's and 45 East are good for dancing, 18 and up. Skipper's is the bar everyone goes to--at all hours, and their outdoor patio is usually full of people. We've got some great restaurants open late too, for the hungry...and often inebriated crowd. Bagel and Deli is a favorite--great bagel sandwiches. Bruno's sells pizzas on the sidewalk outside their restaurant on the weekends, making it more accessible to the people on their way after going out. You can also get take out calzones from D.P. Dough, apparently really great when you've had a few drinks.
I personally love dancing, so if I'm uptown, it's usually at 45 East. The dance floor is a little less clautrophobic, and you can go downstairs if you need a break. It's also easier to request songs. Brick Street is a classic--and on Mondays, they have karaoke, which is always fun. Uptown bars usually have local bands playing on the weekends, which is cool for a different kind of vibe.
If you don't want to dance, you can always go to Kofenya, which is a coffee shop uptown that has local acts playing acoustic on the weekends. They also have board games and great paninis if you want a more chill atmosphere one night. A lot of people come here during the week to study as well. There are also more non-drinking activities, although you can do pretty much any of these things and still have a blast sober. But they do offer "AfterDark," which is movie screenings on Friday nights, or other events, like concerts that come to our student center on the weekends.
The most popular extracurricular on campus is Greek life. No matter how small the community supposedly is, it's everywhere on campus. But there is also the theater crowd, musicians, both singers and instrumentalists, and a lot of great writing organizations. I used to write for an on-campus magazine, MQ, which is mostly opinion/columns of things students are interested in. Miami does bring in a lot of guest speakers, and they are generally pretty popular, ranging from former Speakers of the House to authors doing readings of their books.
There really are a lot of things to do on campus, and if you aren't interested in Greek life, you just have to dig a little deeper to find your fit.