Chances of being accepted into Wharton at UPenn (or other good undergrad business schools)?

[Guacamole]

I'm still in my second year in high school, but am interested in studying business, concentrating on advertising, communications and marketing. I'd like to know more about what I can do in the next two years to be prepared for applying to good undergrad business schools (in particular, Wharton).

What I have so far:
GPA: 3.9 (I go to an extremely competitive school)
750 on SAT II Math Subject (taken 2 times)
Am taking advanced honors courses
Preparing an art and music portfolio
Am president of a community-scale TEDx program at my school
Intern at a social media company
Volunteer at a hospital
Have taken a few classes in comp sci
Spanish Honor Society member
National Art Honor Society member
Play flute in a local youth symphonic group

Planning to take: AP Economics, AP Psychology, US history, AP English and Literature, AP Calculus and Statistics, AP Bio, AP Physics, Spanish Honors, AP Chinese

What other courses/activities would you suggest? Any advice on pursuing a career in marketing/advertising?

Thanks!