I want to stand out to Ivy League colleges. I am going to be a sophomore after this summer so I have some time to plan.
I want to go to Wharton, so I am focusing on business-related programs. What programs/institutes would you say are the best?
For liberal arts interests, TASP is good: http://www.tellurideassociation.org/our-programs/high-school-students/summer-program-juniors-tasp/
In general, getting into RSI is like a golden ticket into any school (not guaranteed, but still): http://www.cee.org/research-science-institute
I’m not too familiar with other business-oriented summer programs. If you want some really good summer math programs though, just ask! 
@DeeperBlue25 Hit me with the math programs
@Deferno54 MOP/MOSP for math. Since you are looking at Wharton, LBW is a really good program. If you could get into LBW, you have a pretty good shot at Wharton.