College Advice

For those of you who have actually worked in the field, what kind of suggestions or advice could you give to a college freshman going into Computer Science? Things to do in spare time, what's important to learn and what isn't, fields to look into, etc etc, whatever you find relevant.

(P.S. My college teaches C, I've been programming since high school, and I have been reading SICP)

>>16
Protip: If you want to get into SE then you will be programming in either C++ or Java. No exceptions. You do realize that today Software Engineering is pretty much all OO, right? I'd say that your University needs to play catch up if all they're doing is teaching C. I suggest reading up on the Rational Unified Process and UML to get an idea of how SE is like.