How can I get into Duke?

<p>Hey, I'm only a freshman, but I've been thinking about colleges and I really want to go to Duke. I've researched it some, and I want to make sure that I do well enough in high school to be accepted by the time I'm a senior. I'm in a lot of honors classes; the highest possible, and I have a 4.7 GPA. My last class rank was #12 in a competitive public high school. I've taken piano for 7 years, I play french horn in concert band and mellophone in marching (although I'm not very good :/), and I'm part of the national forensics league. I'm really just wondering what kind of EC's I should take. Should I try to improve on the french horn? I'm planning on being in Beta Club, and am wondering if I should try cross country. Any suggestions? Thanks :)</p>