If you don't want to do research, don't do research. You will spend your summer doing something you hate and be unhappy. That said, understand that the "top" schools all but require research experience. A fair majority of their matriculants have done research (see MSAR for specific numbers).
I think it's important that you do SOMETHING. Do whatever you find interesting and will be a meaningful experience. If it's volunteering, then do that. If it's some kind of clinical experience, do that.