First of all, congratulations! I think you have to think about what you want-I know for me right now, I want to be home when kids get off the bus most days. I found a job that allows that. Full time or part time? Depends on what that is and what your salary needs are. It may be hard to build a practice if you are very part time. Also, how accepted is part time in your town?
Call also plays into things-like if you have part time office hours, do you have full time call?
I agree about in pt medicine-if you are a hospitalist, you will do only that. The pay is awesome but the job can be stressful-definitely find out if there are caps on admissions and what happens if you have too many pts to see. Shift work sounds nice but to me it seems like being a hospitalist is like being a resident forever...
Also remember, it is your first job. You don't have to stay in it forever!!