Summer School or...

So I’m a freshman at high school right now, and I’m thinking about summer schools. I’ve done a fair bit of research, but I don’t feel like there is a summer school just right for me. Looking at edX courses I had an idea. What if I choose some really hardcore edX courses throughout summer, like CS50X (Harvard), Introduction to Computer Science and Programming With Python (MIT) and Masterpieces of World Literature (Harvard)? These are just examples, I’m not sure if these courses will be available during the summer break, but surely there will be other courses.

I really don’t want to go to a summer school that I’m not THAT interested just to make my application look good. I actually want to have a challenging summer where I learn the things I really want to learn about. What do you think? Is a summer school worth it? Will not going to one really cripple my application?

i’m also looking for summer programs- does edX award credit or