If you don't feel challenged, then take harder clases then. I thought my first year was really easy, and started getting agressive in choosing harder classes. Major CS, Minor Math and Physics, and by the second semester of the third year school was kicking my balls. Plus I was busy doing TONS of extracurricular activities, meeting people, and of course having some fun and going to parties once and a while.

Overrall it was an exellent experience. If I was 18 again, I'd do it again in a heart-beat.