Time management is key - this is the most important thing you will have to learn to make your college experience complete. There are several books about this and I would recommend looking through a couple/few.
Don't be afraid to ask for help after class - utilize TAs and professors at office hours. Some professors are genuinely lonely and I received better grades than I deserved in a couple classes because I walked into an office hour session and said "hey, I want an A, how do I get there?"
If you exercise, continue. If you don't - think about starting. The new fitness facility is top notch and you have to pay for it anyway. I was at the Duke campus last week and a school like that would KILL to have what we have at OSU in terms of facilities. Plus, it's easy to get fat while at school because of the beer/Blimpies/BW3s/Chinese/Potato Chip diet.
Get a MAC laptop if you can. Utilize the student discount through
Apple PC's suck because every hack in the world seems to target MS software with viruses.
Consider joining a social organization (Finance Club, Econ Club, Fraternity etc.) Some of the best soft skills you can learn come from joining a social club and learning how to interact and network with your peers. This skill set alone will catapult your career to unbelievable heights. Trust me on this. Like Jules said in Pulp Fiction - "personality goes a long way".
Take advantage of the college experience. Talk to every pretty girl. You will regret it later if you don't.
Last but not least - pick a major that will allow you to make decent money when you graduate. Ask people in the field what to expect from a salary standpoint and ask them if they actually like their jobs.
Hope this helps - enjoy the experience.