What are good extracurricular activities to get into MIT, Stanford, Columbia University, and USC?
Be a recruited athlete (except for MIT, where it will not give you any special advantage).
After that, there is no golden ticket of EC. Depending upon what you do with the EC, you may be a more attractive candidate to one or more of these schools.
All your posts seem to me to as what I call the “Let’s throw crap against the wall and see what sticks” approach to college admissions. Folly, IMO. Look at this post:
https://mitadmissions.org/blogs/entry/applying_sideways/
Other blog entries on the MIT webpage (or other colleges sites) although offer some insight.
Thank, you have been so much help!