For a school like CPP, ECs and volunteer hours aren’t considered so, there is no incentive to over-state your involvement.
You can read about their admission criteia and applicant ranking here:
https://www.cpp.edu/~admissions/undergraduate/freshman/before/requirements-deadlines.shtml
I’d encourage you to be truthful on all facets of your application. You might be asked to document anything you submit. If you can’t produce it, they will yank your acceptance. Ideally, you’d have log of your volunteer hours but, few people go that far. A simple letter from a teacher or whomever can vouch for your level of engagement is all they’d be looking for. It is not a bad idea to think about how you’d validate any claim before you make it.