My recommendation is that you do not think about what university admissions will think of your ECs. Think about what you want to do. Think about what will actually help people. Think about what will make your high school a better school.
Admittedly it was a very long time ago, but this approach got me into MIT for my undergraduate studies and Stanford for my masters. I never for one moment thought about what I should do to get admitted to these schools. I thought about what I wanted to do and what would actually be helpful.
The best ECs are the ones that you are going to do well.