You have some time, but you must know that when all is said and done, your grades and your classes won't matter to land you a job, your side projects will: http://blog.fairsoftware.net/2009/05/13/being-a-new-cs-grad-...

In the meantime, keep a good balance between study and social life. College is a great time to reinvent yourself and be someone new, no strings attached. Make mistakes now, so you don't make them later.

And +1 for travel abroad at least one year. It will change your perspective on life.