If it is offered, you should totally take ballroom dancing. You learn lots of different styles of dancing which makes it interesting. There is usually a shortage of guys. You generally have to rotate partners often allowing you to meet everybody. Here are some tricks though.
1. Don't be that creepy guy who is there only to meet women. The girls are NOT there to only meet guys. They are there to learn how to dance, that should be your goal too.
2. Be a good and solid dancer and most importantly, leader! For the girls, half of the trouble comes from learning the dances and the other half is from dealing with shitty leaders. Practice the steps outside of class and come to class to work on your leadership and partnering skills. If you are the guy who makes their learning easy, you will be the one they want to practice with.
3. Make friends! In my life, the best girlfriends were friends first and nothing makes friends better than a shared new interest....like ballroom dancing!
If we long for our planet to be important, there is something we can do about it. We make our world significant by the courage of our questions and by the depth of our answers. --Carl Sagan