The most valuable thing you can do in college is learn how to think. As an employer (and I am) I don't care what you thought about, but I do care how well you learned what you did. In particular, I care that you are bright, that you can explain abstract ideas clearly to others and that you can write well. That can come only from thinking about a lot of different things in a lot of different ways. (For more on this from an employer's (that would be me) perspective, go read The best interview advice I received.)

I write software, and do some math, for a living (my other degree is in math). The fact is that most good programmers don't learn what makes them good programmers in their undergraduate majors. They learn it by doing, being curious while they do it, and thinking about their mistakes. What's hard about coding is design, and design is a funny mix of engineering, experience, aesthetics, and seat-of-the-pants instinct and intuition. It's about thinking in abstractions, and this is exactly what the liberal arts were intended to teach. The original trivium was: grammar, rhetoric and logic. Then as the ancients discovered the importance of numbers and added the quadrivium. They didn't think about these as distinct catalogues of knowledge to be learned so much as ways and modes of thinking.

Sometimes people ask me what books to read to become a good C++ programmer. I usually recommend:

You will notice that none of those are about C++. This is because the details of the language are the easiest thing about programming in it. In fact, I then suggest they learn a pure-OO language like Smalltalk first (though not everybody buys this approach).

Of course, the above is all about programming, but it applies equally well to any job (in fact most jobs require fewer specific skills). The point is that it's the breadth that is important. That's what liberal arts has come to mean in the modern context: the span of thought from architecture to zoology. So study economics, statistics, math and CS (all but the last are classified as "liberal arts", btw), but also study anthropology, 17th Century poetry, the visual arts, and comparative religion. Not only will it make you a more interesting person, but it will give you the ability to do the quality and breadth of thinking and writing that will make people want to hire you for whatever career you choose to pursue. Because the rest is just details.