Internship for Medical Interests?

<p>I am a rising sophomore and planning to get an internship for 2013 summer. I want to go towards the medical field for my future career, so I currently volunteer at the Children's National Medical Center.
Does anyone recommend any internships towards the medical field, perhaps in a hospital or clinic? Should I keep volunteering at the Children's National Medical Center to show the responsibilities I have so I can ask for an internship there during next summer?</p>

<p>Any advice?</p>