At this point in your life, your friends will have more influence on you than your professors, mentors and family combined. Choose your squad wisely. Live life, have fun, wild out (a little), but be mindful to surround yourself with positive, goal-oriented people who encourage and motivate you.
11. Get involved
Do as much as you can handle. Join clubs, run for office, pledge if you want. This will arguably be the best time of your entire social life. The networks and friendships you build now will last a lifetime and the leadership experience looks great on your resumé.