As a freshman I didn't even think about college (wish I had) so your off to a good start.
Come up with more than one college option. Make sure your "well-rounded". Participate in clubs, sports, and music. I always found drama to be fun. Make sure you get a real good start on a second language; you will need it for a degree. Make sure to have a good relationship with your teachers and guidance counselor. They will be writing your recommendations.
I've done taekwondo, played tennis for my school (might go back to that but getting home at 9 and trying to do homework wasn't working out...), I'm going to be learning the guitar and keyboard, I ride horses, and I'm in Spanish II but I'm not doing as well as I would like to at the moment. I would like to learn German or French soon though. I love my teachers and my guidance counselor is also my math teacher. She's amazing!