Well, I admit your question is not trivial, and many doctoral students try to view themselves in the shoes of the faculty with whom they interact. It's not completely clear if you are just a Ph.D. student or an M.D./Ph.D. student (though it seems that you are the former), but you may want to ask your program directors about what you should do. Especially in Boston, many of the schools there have good support centers for doctoral and postdoctoral trainees.
Do your best in your grad classes, especially in biochem, cell/molecular biology, and whatever upper-level science coursework you need to pass your qualifiers. Medical schools really favor people who can show they can handle upper-level science/biology that they'll cover (briefly) in class, and you have an opportunity to learn in a little more depth what med students are going to be taught. Heck, see if you can take a class with med students and see if you like that atmosphere. I attended one class in anatomy/physiology related to my area, and while I know one hour may not represent an entire two years of med school, I knew I didn't like being in a large lecture section and not covering material to the level of depth that I wanted or became used to in graduate school.
What makes your question hard is the reality that what may make you happy may completely change in a few years. Sure, clinical medicine can be very routine, but you won't be doing residency shifts for the rest of your life (if you're talking "day in the life" lifestyle choices). Similarly, the "day of an academic scientist" completely changes depending on the discipline, the area of research, and one's ability to find funding.
You need to figure out for yourself the work environments in which you will thrive, but you need to frame the question on what environments would make you succeed. What types of bureaucracy do you like (since no one can ever be free from bureaucracy)? What relationship do you want with your potential supervisor or boss? How much "non-busy" time is ideal for your productivity? What questions do you like to answer, or do you like solving variations of the same problem?