I think summer programs that cost money are a waste of time for college admissions, or at least they are not worth their money. Most of them are just cash-grabs my universities. This is what I did the summer before my Senior year:
1. Went to a month-long, free, and rather prestigious pre-college program hosted by my state. (I know most people don't have this opportunity, but going to an expensive program is not really a substitute)
2. Went to a novel-writing class. (This cost money, but I didn't mention the program at all. I just talked about the novel I wrote for my essay.)
3. Volunteered every week day at an inner-city children's program. Got about 150 hours.
I'm not saying you need to do this, but this is an example of what I think was a productive summer.