Ask HN: As a student, what should I spend my time on?

I'm currently studying Computer Science and I work part time as a Web Developer. Something I've been thinking about a lot lately is what things I should be focusing on now to set myself up best for life after I graduate. I always feel like I should be doing more - working on other side projects, etc.

So those of HN that have graduated and gone on to various careers - what advice would you give to someone still studying? What things should I be spending my time on? Should I focus on my own projects full time while I'm still young?