I really want to have the opportunity to have the highest chances at a good university. What activity can I do now
or during summer could a summer program help boost my chances?
Just be yourself. Do thoughtful and meaningful EC’s to yourself. A summer program does not get you into a university more than a meaningful activity can possibly can. There are so many summer programs that it is common to have one but good stories are rare to find. Find an activity that is positive to your community and that you like and perhaps an essay idea will come of it.