Still looking for summer plans? A non-profit called The Family Van is located in Boston and is an amazing organization that goes around neighborhoods in Boston working to improve access to healthcare by providing preventative healthcare screening while educating residents etc. (website below). They have an application out for summer internships.
Link to website:
http://www.familyvan.org/about-1
Link to Internship
Info/Application:
http://www.familyvan.org/volunteer-application