I certainly don't have the wisdom of some of the guys on this board (not sure if you looked at Undaunted's profile), but here is what I've concluded as a college sophomore at UT majoring in Philosophy. Bare with me, this could be a long one...
I should have gone to OU, Purdue, or some other college where I could get a non-aviation degree, but probably double in Aviation with transfer credits from getting ratings and training. Why?
First, Austin is not a good place for general aviation. There are not many places for training (thanks to Michael Dell), and while I know I can and will find good instructors, I'll be driving at least 30 minutes both ways for the rest of my training. Things might still work out for me here...I'm trying to get a job handling bags for SW or some other odd job for the FBO's out here.
Second, it's not as hard to double major as you'd think, depending on what you decide to do. I'm also in a very distinguished program specific to UT called "Plan II Honors." I won't go into details, but it is a "well rounded" degree in itself, with a bit more liberal arts than math or sciences. I ended up adding the Philosophy degree because Plan II required 9 hours of philosophy anyway, so I was already pretty well on my way. I have a lot of random hours that won't apply towards anything except elective hours, but I'll still be able to easily graduate in 3 years with degrees in Plan II Honors, Philosophy, and minor in history (with the option to take 1 more class in English, Rhetoric, Spanish, and I think several other areas to have minors in those also).
I could graduate in 3 years with no problem, but I'm going to stretch it out while I get my aviation training, and have Dad's health insurance and free flying (he flies for AA) for another few years. How am I already so close to finishing? AP CLASSES!!! Take as many as you can, and study for the exams. I say again, STUDY FOR AP EXAMS!!! Once more, STUDY FOR AP EXAMS!!! I got a decent bit of credit from AP exams, but could have had tons more had I actually studied for them (I'd say I studied about 1 hour a month in high school, 1 hour total for all of my AP exams). Be sure to do well especially on the Latin AP, or any other language AP, because most colleges, if they require a language, make you go to class 5 days a week for that language. 5 days a week for any class is horrible, so just test out of it. Don't even worry about what your respective college will take for AP credit. Just study hard for everything. Maybe you'll end up transferring, or changing majors, and all of those random AP credit hours will help.
Stay in those organizations you're in in high school. I quit debate my junior year because I didn't have time between playing in 5 bands and on 2 hockey teams. I don't really regret it, but I wish there was a way I could have continued debate. Fortunately, philosophy is the same thing but better, so take a few philosophy courses in college. Keep up with the math. High school algebra is ultra lame compared to college math, or even calculus, so don't worry about your goofball algebra teacher. I loved calculus in high school, but even it seems boring having tasted some of the "more exciting" areas of math like number theory and non-euclidean geometry.
If you've got time, get your PPL and anything else you can do before college, or really just ASAP. If you feel like you're falling behind, take a summer to knock out your instrument, or get some aerobatic training. When you get to college, DO NOT COMMIT TO A 1 YEAR LEASE!!! I'll be finishing up my PPL soon and would kill to get out of my lease (goes through summer) to go home, live for free, and get my instrument at any of the fantastic FBO's in DFW. Since I'm stuck with a summer lease, I have to stay here, take summer classes, and drive to Georgetown (a nightmare) several times a week to do training up there. Keep summers open for cool things. Even if it's not flying, go study abroad or get an internship someplace. Taking classes is a lame way to spend a summer, especially when you're a senior going into your third year.
When you get to school, if you have any inclination whatsoever, try out an engineering program. Almost any other major will be a waste of your time, unless you like paying tons of money to get an education you could have gotten for 3.50 in late fees at the public library. Alright, that's a bit harsh, but most of my classes have "followed the textbook" pretty closely, and I've wondered why I am there. Do not take history classes in college unless you have to. If the topic interests you, find out what textbook they use, and rent it from the library. Stick to technical areas and you will be rewarded with an education that will be difficult to teach yourself. Major in liberal arts and waste time reading books you could have read for enjoyment and without deadlines. Major in business and learn common sense while doing group projects with a bunch of idiots. Major in "commuications" and learn nothing. Major in the social sciences (a branch of liberal arts I guess?) and learn how to B.S., or just do that in your other classes when you have papers due.
Apply for scholarships. There are millions out there. Tons don't even get claimed. You can apply for many as early as your junior year, so don't waste time.
I think that's about it. I have my thoughts on how things will pan out, but in regards to specific hirings, check the "interviews" forum and ask some of these guys that have been around for what you need to do to get hired. I hope my thoughts will help you make the best choices in getting started.
To summarize: Go to a cool college that has good aviation nearby (I've gotten the impression from other threads that training through the schools part 121 is typically a bit pricey, so look for schools with good FBO's nearby and take from them...if I had to do it again, I'd go to OU because I could get instate tuition...if you keep your grades up and have good test scores, you can get instate almost anywhere though. There are a lot of aviation scholarships for part 121 schools though). Do your best on AP tests. Try engineering or some other technical field - Aerospace, physics, math...anything along those lines. Do them first, and take liberal arts on the side if you're interested. Remember, you'll have the rest of your life to read great books and think deep thoughts, but it's not real easy to teach yourself multi variable calculus or advanced thermodynamics on your own (I know first hand). Just make sure you like wherever you end up. If you end up at a school where you'll be making big bucks hauling freight and rich people by your junior year, but you're miserable and have no social life, it's probably still going to be a long 4 years.
Sorry for being longwinded. If you have any other questions, please ask.
Good luck!
One more thought: Remember to have fun in college. There aren't many ultimate frizbee clubs for old guys. My training will probably slow down in the fall/winter because I know after these next two years, I'll never be able to lay someone out on the ice, or get in a legal fight again. Go crazy for flying, but make sure you don't pass up too many once in a lifetime oppurtunities for fun at college.