I dont think adcoms care too much about what type of volunteering you do, but im sure they would like some of it to be in a healthcare setting. I have done stuff through my church with Habitat For Humanity, Salvation Army, Cooperative Emergency Outreach...and now I am a Big Brother, i volunteer in a nursing home, and plan on volunteering at the local VA this summer. I have worked at a hospital for 4 years now as well. Just try some different things out: there is a lot more out there. I have some friends that volunteer with some local outdoor clubs that clean up the parks, trails, and lakes. Or some answer phones and make calls for American Heart Assn. and the American Cancer Society. Just make sure youre doing it for the right reasons...good luck!