Community Service
Tutor other kids (high school or elementary school) in subjects; be a mentor
Volunteer or work for a nonprofit organization like Chai Lifeline, Ohel, HASC, Camp Simcha, etc…
Take AP exams. If your yeshiva doesn’t have them, sign up to take them in a school (public school, for example) that offers them
Form a yeshiva basketball team and include it in your resume (I’ve seen this before)
Debate team (you can give a chaburah and call it a debate, because there’s no way for a college/university to refute your claim unless they come to inspect the yeshiva)
Take computer certifications (there are a number of them through Microsoft)