text: You hit the big ones that I would have suggested.  Be careful and not to overextend yourself.  Your grades are important and being a tutor is a great way to help others and keep your academic edge.  Also, working with the professors on projects.  It is better to be good at a couple of things than to be so spread out you are not good at anything.  Have one activity where you are in charge.  You will gain a lot from that experience.