Oh, another thing, be sure to keep all your syllabus and remember which classes you can miss if necessary. Most professors keep the entire class schedule (all tests and such) on the syllabus so you can know which days you can miss. Obviously, you shouldn't take off everyday you can, but its psychologically easing knowing you can skip class if you need to.
DO NOT carry a book bag or anything more than a laptop or notebook to class or people like me will make snide comments about your newry. Don't carry your student id on a neckring or anything like that that will make you look like a tacky freshmen. You may want to find your classes the weekend before class starts so you know where your going to.
edit: wow nice new autocensor
It is a very good idea to keep every syllabus you get. Not just because it will help in knowing what classes you can skip, but if you ever have to transfer, your new school will require that you show them your syllabi so you can get credit. Staying on top of your paperwork can save you thousands of dollars.
And forget what Kulade said about backpacks. That is stupid. Bring everything you may need to class...if your professor allows laptops, and its useful for you, bring a laptop. Bring your books, notebooks, whatever.
In most respects it's similar to high school.
Really? I found the two experiences to be nearly completely different. The amount of freedom you have in college, compared to HS, is incomparable.