Hmmm well let's see if I can take a stab at this. Below are the stats of a hypothetical person I would think would get into a top ten.
-GPA > 3.8
-MCAT > 35 (though 37+ would be better)
-2+ years of research
-1+ published papers with your name in them
-200 hours shadowing doctors
-300 hours volunteering (includes hospital/ medicine related volunteering and community service - I would join a community service organization and stick with it for all 4 years of college)
-play an instrument for 4+ years (or show dedication to something artsy)
-become a part of a student organization that has a lot of weight on your campus (such as a student council, honor council, diversity council, etc) and stick with it for 3+ years in college. Become President your junior or senior year.
-If you like to write, become a columnist for your school newspaper
-Get an on campus job that allows you to do hw while you are there (library desk, department front desk, etc)
-Form strong relationships with faculty/staff - I ended up on a search committee for a new faculty position because of this.
-Work out regularly and take care of your own health overall. If you're going into the health profession, you have to practice what you preach
-Pick up an interesting hobby
Ok I'm out of ideas. Basically have perfect to near perfect numbers and then along with the solid volunteering/ shadowing/ research have some ECs where you show strong leadership and dedication. Plus other things that could be unique/ make you stand out.
Good luck!