Don't be a butthead. There's really nothing to be gained by acting like a jerk, so be nice. It will pay dividends down the road.
Share your notes.
Find a passion for something, whether it is journal, moot court, mock trial, a club, whatever. Volunteer. Be a leader in it. It will be a pain in the ass more often than not, but it will help keep you sane.
Get the hell out of the law school as often as possible.
Get to know the deans, professors, and staff. Say hello. Make conversation. The time will come when you will want to ask them for favors, and it will help if you know them and they know you. You don't have as much control over your grades as you'd like to think you do, but you have lots of control over your reputation. In the long run, your reputation will get you a lot farther than your law school grades will. Start working on it now. You'll be glad you did, and it really doesn't take any effort.
Try to see the humor in things. Remember that almost everything that happens in law school has an element of the absurd to it. If you can keep smiling at that, it'll help you get through it with your sanity intact.
Eat good food. But not too much of it.
If you have to go up or down one floor, take the stairs.
Go outside and look at the stars every now and then.
Try to keep your house/apartment/room relatively neat. You'll feel more organized if the things that surround you look organized.
When you get a chance, take useful classes. Try to avoid classes with closed-book exams.
There's more, but I'm going to finish this exam if it kills me. Best of luck next year to all.
Split, can you put these on a pretty poster to sell to 0L's? I bet you'd make a killing!