Hi! This is a great question that I definitely thought of when I was in high school. I just got into medical school, and I can honestly say that there are no "right" extracurricular activities. My best piece of advice is to focus on doing the things that you care about, and the pre-med part will follow. I did activities that were policy based and played a sport which I'm pretty sure made my application stand out. The one thing I would recommend is to shadow physicians, because that is the most helpful thing on this path. Hope this helps!