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)

So uh...

Anyone care to give any advice to a lowly college freshman? Learning C for the abstract bullshite (as well as some C++ to teach OO, but i've already learned that shit in high school with Java so meh), but outside of that what courses (or just subjects) should I look out for to take? (or maybe look out for to *avoid*?)