So I am about to enter my Senior year of high school and for the past three summers (including this one), I have take summer classes at my local community college. I didn’t take them for missed credits during the year or because it’s required, but because I wanted to get ahead.
What exactly do I list summer classes as? I heard that they don’t count as extra curricular since the classes I took are needed for graduation but at the same time, I could have taken them during the school year so taking them during the summer to make room the following year for others classes does seem like something extraordinary to me but admissions may see it differently. For example, I took calculus I during the summer to take calculus-based physics the following year and also finish high school in Calculus III (this is my plan for the upcoming 2017-2018 year). I took required electives to make room for the Honors classes that my community college offered (keep in mind, I am still a high school student at an Early College high school hence these opportunities). I also did it for a slight GPA boost. 
Lastly, tying in the point in my last paragraph, how good does it look regardless of how admissions (or myself) perceive the accomplishments of college classes during the summer? I could have gone on vacation, done nothing, etc but I chose to spend all my summers of high school taking college classes. That’s what I see though. So as suggested by the title, how good is it? What is it the equivalence in terms of accomplishments? I want to get an idea of how good. It is comparable to volunteering hours? Or something a little more such as President of a club? Thank you.