There are many, many student groups on campus. Just about anything that you can think of. The most popular are intramural sports (really casual and easy to get involved in), student government, and various others. I'm in a group called Duke Engineers for International Development (DEID), which is essentially Engineers without Borders without the official charter from their organization. Last year, I was involved with the El Salvador project. During the year, we worked on bridge designs and fundraising for our project. Then, over the summer, a group of ten of us (from all engineering disciplines) traveled to El Salvador and stayed for eight weeks. We worked with an NGO from the US called Bridges to Prosperity, and built two suspended footbridges in neighboring communities. Then we rehabilitated a vehicular bridge. We also go to interact a lot with the communities, which included playing soccer with schoolchildren. It was definitely the best experience of my life, and before Duke, I never thought it was possible that I could get involved in something like this. It was my first time out of the country. I'm still involved with DEID this year too. I'm fundraising chair for the El Salvador project, but I'm also involved with the Bolivia project. I'll travel to Bolivia the first three weeks of Summer 2012 to build another footbridge with 7 other Duke students (we're working with Bridges to Prosperity on this project too). These types of projects might sound boring to non-engineers, but rest-assured that there are plenty of other projects for non-engineers too!
Every week, we get emails of all of the different events going on during the week and on the weekend. There are a variety of events--musical, theater, entertainment. My favorite is the weekly movies they show. Duke will show movies that haven't yet been released on DVD but are out of normal theaters, and students get in for free. Aside form these events, Duke students are also huge athletic fans. Even though our football team isn't great, students still enjoy the games. Basketball season is huge too (as I'm sure most people know!) Cameron Crazies are the best fans in the world (I am slightly biased.)
I met most of my close friends last year in my dorm. I'm also friends with people I've met from classes though. It's really easy to meet new people at Duke, which I love. As for dating, the scene at Duke isn't huge, but it's definitely apparent. Last year, as a freshman, I didn't notice it too much. Freshman live on a separate campus than upperclassmen, so it was rare to see couples then. It must have been because people were still getting to know each other because this year I have seen a lot more couples. Some students are too busy to date I think, but there are definitely people who make the time for relationships.
On a Tuesday at 2 AM, I'm up studying. Students work hard during the week so they can enjoy a little time off on a Friday or Saturday night (and Thursdays for many students too). People, whether or not they are in a frat/sorority, like to go out and have a good time. I will usually go out to dinner with some friends and catch a movie on the weekend. I'm not a big partier, but I still have a social life. You don't have to party to make friends, but if you do party, you will definitely have a good time here. I don't go off campus too often even though I have my car. There is always a lot to do on campus, so I never feel like I need to leave!
One of Duke's big annual events is LDOC--Last Day of Classes. We get a few very popular musical artists to come perform. Past performances were from Ludacris, Mike Posner, and Kanye West. Students enjoy a day of fun before having to study for finals. There are many other exciting events throughout the year though too!