From my experience with friends who have applied before, talking to profs/admissions people, and others, all med schools really want in your "clincal experience" is an idea that you know what you are getting yourself into. Heck, I have a friend who got into Duke without research AND without clinical experience at all (or nearly...she had shadowed a doc for a day in high school). It wasn't ever even brought up in the interview. Her scores weren't even super grand. She was just a good, well rounded student. At one of her interviews it came up briefly, but wasn't a big deal (she got in there too). The interviewer even said they just wanted to make sure that she knew she really wanted to be a doc. If you want to volunteer at a hospital, great, but if you have other things you would rather do, just shadow a doc for a little bit...not like there is a whole lot you could really do anyway. Just my experience/opinion...