to the marine bio aggie: double major. If you have two degrees you'll be more able to market yourself better.
As for what to bring to college: clothes, quarters, good attitude. It's amazing, but you really don't need much, you'll find yourself accumulating a ton of crap over the semesters.
My only advice is to watch your GPA the first two semesters, it's the easiest time to screw it up and you'll spend the rest of your college career trying to fix it. That and do as many internships as you can, hell, that's almost as important as the actual degree.