Help yourself and buy a set of review books for the content on the MCAT (I wouldn't worry too much about edition as long as the publishing date is post 2007; you can buy another set of books when you really sit down to prep for the MCAT 2-3 years down the road). DO NOT spend any time during the summer reading any of it, but once your pre-med courses start, use the books to aid your studies.
People may label you as a gunner, but you would instead be the smart person we all wished we were before starting college.
Here's the insider scoop from someone who's been there and is about to start med school: Colleges do not teach MCAT, they teach science. More often than not, you end up learning more than you need to for the MCAT during your pre-med course work. Obviously, you'll have to cram/memorize (or even learn) to get the A in your science courses, but stay ahead of the game and supplement those classes with MCAT prep books to see what you must pay attention to during the course as far as the MCAT is concerned. That way, you'll have had the first iteration of learning some of the MCAT material through your coursework. In addition, the way most prep books explain the material is easier than the way college textbooks do.
This implies that the MCAT is a big deal, and if you're not aware of this fact yet, you will be soon. Try not to spend more than $100. I would recommend using craigslist. IMO, Princeton Review has the best materials.
Oh--as far as jobs go, do well in your college courses first semester. If you do, you may be able to find a job as a tutor on campus. It's easy, and it pays well (I started at $10-12/hr).
Other than that, find a hobby that you can develop for the rest of your life. If you already have one, stick to it through college. Devotion, dedication, and discipline are all qualities admission committees look for in applicants, and what better way to demonstrate that than with a hobby that will have lasted you through high school and college?
Good luck!