Sell the BMW. You'll need the money for school and you won't have time to drive it anyway.
A few things off the top of my head:
Rec letter from premed advisor is very important. "He's a great student here and he will be a great student there."
Shadowing is important to get letters of rec from practicing physicians.
Extracurricular activites <insert joke here> are important. What do you do when you dont have your head buried in a book?