How can I make top colleges consider me for their school rather than the next person? What can I do extra?

I am going to be a junior next year and MIT, CalTech, University of Pennsylvania, Columbia, NYU, Brown, Cornell, etc. are some of the colleges I am considering attending. These colleges are extremely selective and have high prestige. I know when I apply, I need to put something on my application that will make the selective committee consider me.

Right now, I am working on my PSAT, volunteering at a library, attending Speech & Debate workshops, being involved in school activities, and taking as many AP classes as I can. I am also in a summer program that gives me college credit, but I know I need more.

Do you have any ideas on what I can do to make these colleges consider me? And do you know of any summer opportunities available (either for this year or next) that will heighten my chances of getting in as well as online programs that provide AP or honor classes?
Actually, I haven’t narrowed down my choices at ALL. I am interested and open to everything! I am in speech and debate, which led me to mock trial, presiding as a lawyer in an older case. I am applying for an internship with a pediatrician, reading books about the female human brain and college sociology textbooks about marriage. Everything sparks my curiousity an insane amount. I love to write, help others, argue, dig up artifacts. I have yet to narrow down the list of possible careers available by even one. :(
My counselor could not even help me…
Really? My friend took AP classes every year, received a 2100 on her SAT, was ranked fourth in her class, and involved like crazy at school, but she only got on the waiting list at Columbia. She did not end up being accepted. Anything special you did?
Thanks! I know it’s extremely difficult to be accepted to a schools like this, which is why I am trying to find something that sets me apart. My HS does not provide many different opportunities, but leadership positions are reserved for seniors in most cases. The colleges on this list are completely different, but I just really want to get into an Ivy League School (not just a sister school). I am in a wide range of ECs because I am trying to figure out just what I want to do with the rest of my life. I figure experience goes a long way. You, at least, know what it’s like (or get a glimpse). Luckily, I have one teacher/mentor who writes awesome recommendation letters! One of the problems with interviews and visiting the campus is that I live in Texas, and most of the schools I am interested in are in New England. I visited there once when I was younger, and that is how I know I like it, but I cannot afford to go again (except if I get accepted). Thanks again! I really appreciate it!