When I was younger, listening to stories about applying to undergrad, I started hearing about extracurriculars. I got a little worried because I didn't do much that showed up as a part of my school record. Nonetheless, I eventually applied to the one school to which I wanted to go and got in.
It wasn't until recently that I realized that I had strong extracurriculars all along, even if they weren't the cookie cutter track team, debate team, yearbook, blah blah blah ECs that I heard about on TV. After all, I had studied ballet seriously all through high school, spent more time in dance classes, rehearsals and performances than I did studying (and I studied A LOT), and even choreographed a number of pieces for school shows. Never mind that I later did dance and choreography semi-pro, in h.s. it didn't even click that those things were ECs, and that they quite possibly got me my ticket into my top- only- choice school.
The moral to the story is: Do what you love. You are going into a helping profession, so you'd better love to help. So help. But beyond the typical volunteering, shadowing, and research, a love for running, basketball, sculpture, gardening, or anything else (except certain forms of pop entertainment, I'm sure) should be lived and explored. What makes you you? Then be you, and do those things. And find out what you love in the cookie cutter arena. If you really like working with the elderly, as I do, then don't bother signing up to work with kids, because there are opportunities that will suite you better.