To the OP, it sounds like regardless of where you go to school you'll be getting a degree in a valued field. Congrats! I'm sure you've already considered which schools are academically suitable for your potential majors.
Firstly, make sure you study a field that interests you. You've identified three potential fields that are all quite different. Which do you find the most interesting? The answer to this question will be important; if you pick a major you aren't that interested in, it's easy to become resentful of school and either slack off or drop out--particularly if the mountains are calling to you. Even worse would be finishing your degree despite disinterest or dislike in the field and spending your life dissatisfied. While there is always the possibility of going back to school, and while I'm a firm believer in lifelong learning, our time is our most precious resource. (Unless you become a biochemist and fix this situation!) If you can make a choice that most appeals to you at least for now, you'll be in a better position than the guy who just floats into whatever program seems the most competitive or easiest.
The other ideas of doing a gap year either before or after university are great. Your skiing will develop tremendously if you join a focused program like the equivalents of Ski Le Gap, Rookie Academy, or Alltracks - or if you're already skiing past the level 2 instructor standard, there are race coaching programs or you may even have fun working at a bar or restaurant skiing during your days off. I wish I had gone this route! Finances are a consideration. Maybe if you go into a co-op program and get some good placements this could be feasible after graduation.
Lastly, you may want to consider how your career may impact your ability to achieve balance in your life. For me and maybe you, that may involve being within commuting distance of a mountain. Some jobs lend themselves well to working in small towns, and other jobs lend themselves to physical environments. Doctors, lawyers, pharmacists, kinesiologists/physiotherapists have an easier time finding skilled work around ski hills than, say, quantum physicists, radiologists, or economists. I'm studying to hopefully achieve a masters in education. The field interests me, and I do hope to find good contracts for six months of the year in order to ski the other six. That said, I wish I'd had the foresight and aptitude to do an undergrad in a field relevant to broader populations. My life would have been a lot easier. (Though I didn't even know I liked to ski at the time, and always envisioned myself living exclusively in a big city. Who'd have thought?)
I recognize my response doesn't directly answer your question about which college to choose, but hopefully you can still get some use out of my post.
It's a lot to think about... best of luck and congratulations on your acceptances!