What can I do now?

I was wondering if anyone had any suggestions as to what I could do to prepare for law school and a career in law as an incoming freshman for my undergraduate education?
A little background: I was accepted into University of Rochester and was thinking about majoring in economics and pairing it with something else (suggestions?). I was wondering if anyone here could suggest what I could do now to prepare for law school as well as what would be most useful to major in.
Thank you!