Well, here are my two cents (I probably have change coming):
Research looks good, but if your not interested in the research aspect of medicine, your interviewer is probably going to see that anyway. I, for example, am not really passionate about research and choose not to do it. However I can not get enough of patient care, which after all is why I am going into medicine. Most of my activities have revolved around that. These would include working in an ER, directing a medical team for my school's martial arts team, and becoming an EMT. Though I tend to get really nervous in interviews, I feel I can project how passionate I am in these activities.
Now I can tell you its important to be efficient with your time, but I can't really tell you how =). All I can say is, recruiters are looking for a broken in boot, rather than a shiny and crisp new one. Ok I know that metaphore is bad, but what I mean is, you got to be well rounded and comfortable, not stiff minded and high strung. Stellar marks are not going to do it alone, and it would be better to have good marks with great extra curricular activities. From what my research has shown me, if you were involved in good activities that shows your dedication and can maintain a GPA above a 3.55 or so, then you have a pretty good chance of getting in to a medical school. (PLEASE PLEASE PLEASE, anyone who falls below this, DO NOT WORRY, the average matriculant GPA is lower, just do your best, do not let things like this get you down. If medicine is what you want to do, there is always a way).
I hope this helps somewhat.