I thought I'd give an answer to the original poster since everyone else is just bickering.
Internal medicine residencies vary in the types of rotations you do. Most have a combination of 3 types of rotations:
Ward rotations: May include general medicine and subspecialties (cardiology, ICU, hematology, oncology, etc). Whether there are other subspecialty services depends on the program. These are the tough months. Round or preround around 7 am, round with your staff later in the morning, and do work during the day. Take call every 4-6 nights and admit patients. There are innumerable permutations of the call and admission protocols. Almost all programs will have a morning report where an interesting case is presented and teaching points are given. Most will have some other conference during the day. Average hours range from 7-6 with some days leaving at 4pm and some at 9pm.
Consults: Subspecialty consultation in any of the specialties. These include cardiology, gastroenterology, endocrinology, oncology, pulmonary, hematology, rhuematology, infectious disease and others. These months you consult on patients on general medicine or surgical services. Generally, these months have no call or less call and you learn a lot about the specialty.
Clinics: Vary greatly from place to place. The program I did my inteship had month long clinics ranging from Veterans Hospital clinics to university health clinics. Also, all residents will have a continuity clinic. This is in addition to regular responsibilities. Usually 1 or 2 half days a week you see patients in your own clinic with a staff overseeing your work.
Again, each program will vary, but this is the general framework. Its actually pretty interesting at times and very busy most of the time. You're usually busier on call than surgical teams except for the trauma team. You will be surpised after just a year of medicine how much more you know about the effects of medicines and how to treat diabetes, infections of every sort (I took care of several epidural abcesses), myocardial infarcts, and many many more specialties than your surgical counterparts.
With that said, I have since moved on to radiolgy. Medicine is interesting and it is the gateway to some very interesting specialties. In the end, the difficult patients have chased me into the dark rooms. Good luck with either FP or IM. Either way you have much more patience than I do.