As tjr said, it would be helpful to know what sort of things interest you. My advice is to find an open-source project that you use every day or find technically interesting (firefox, amaroK, open-office, gaim...) and try to get involved.

If you are adventurous, and freshman year in college is the time to be so, don't pay attention to what language the project is written in -- working on a project with an established code base in a language you DON'T know might actually be better than getting into one in a language that you do, because it will better motivate you to become proficient in it and, though they won't necessarily want to hold your hand, you will have the oversight and assistance of everyone working on the project.