<p>Everybody else has given some great info, so I'll just say welcome, and that your extracurriculars look a lot like mine did in high school! :) You certainly don't have to do any math/science ECs -- although I think many people who end up at MIT have done them, just because we happen to like science around here. But they're certainly not required for admission.</p>
<p>I always thought it would be fun to start a club that went around doing science demonstrations for the younger students in my school district.</p>
<p>If you get bored with the coursework offered at your school, you could try taking distance courses through a number of schools -- Stanford's [url=<a href="http://epgy.stanford.edu/%5DEPGY%5B/url">http://epgy.stanford.edu/]EPGY[/url</a>] program comes to mind. You could also take a course or two at a local university, if your schedule permits.</p>