I have exactly the same experience as Troutman apparently (engineering ---> law)... Here is some advice from an old man...
1) Unless you have your heart set on engineering, or something similarly nerdlike, take liberal arts (history, poli sci, etc) - (a) the books are actually interesting to read in their own right, (b) you can get all your studying done while taking public transit to/from school, (c) the atmosphere is really relaxed, and (d) the best looking women are in liberal arts. You can always take Law or MBA later, once you want a real job - alternatively, you can stick with Liberal Arts all the way to PhD, become a professional student and then a professional slacker (professor).
2) Study the calendar, plan well and register early - after I left Eng, and switched to History, I was able to limit my classes to Mon/Wed/Fri, and generally to mornings (I am a morning person)
3) This part is ethically questionable
- you can choose your paper topics in such a way that your papers, with minor or no alterations, can be used in 3-5 courses. To wit: I wrote a paper on Soviet foreign policy in the Far East leading up to WW 2. I was able to use this paper in History of World War II, History of the Soviet Union, History of Foreign Policy, Development of Foreign Policy (poli sci course), expanded into my Honours Thesis, and in a tour de force, expanded it a bit more into my Master's Thesis.
4) I was able to get by with writing all my papers the night before. This is not for everyone, but if you are actually interested in the subject, are a good writer and reasonably smart, it's not hard to knock off 2000 words.
5) Life advice that I didn't follow myself - whatever you, don't waste any of your limited money on "stuff" - use it on women and booze. Get your furniture, TV, stereo used for cheap because once you become an adult, you will realize it's all crap anyhow, and you'll need new "stuff".