1. Leave your dorm room
Seriously. Just go outside for a little while.
2. Get off campus
Explore your college town (Or, if your college town is like mine, explore the surrounding towns).
3. Interact with people not in your area of study
Are you a business major? Befriend some art majors.
4. Get a job (if your schedule allows)
This one is literally directed at myself. I need a job. Someone send recommendations.
5. Try new things
If you're not coordinated then maybe not skateboarding, but anything else probably.
6. Keep your health in mind
Eat right, get plenty of sleep, take your vitamins, the whole shebang.