i really dont know what to be involved in this year... either a new research lab, because my old one got really boring...or more involved in community...
The very top tier med schools probably tilt toward research, as they tend to be more research and academia oriented. But you're going to need everything and the kitchen sink to get in, so it's not a question of 'or' you need research, volunteering, and much more.
On the dean's list, I'd put it, but not as it's own entry. I think I summed up all my dean's lists, a departmental honors, other little awards, etc in one entry.