Some sound advice above. I definitely agree with items number 2 and 3; the only time that I've had to give a student a bad evaluation was because she would consistently not show up early enough to get the minimal work we had asked her to do done. Bear in mind that I am no early riser and we generally don't give students more than they can handle - but I (nor any other resident) should not have to ask a student MORE THAN ONCE if they can handle the work and to come in on time to get it done. 'nuf said.
I do however disagree with the advice given in Item 5. Showing interest is great and we all love enthusiastic students, but no one expects everyone to love their field and we hate nothing more than a suck up or liar who insists every field they rotate through is their favorite. Frankly, I'd think more of someone who DIDN'T want to be a surgeon. Be honest - or at the very least, be p.c. and say that you're giving every rotation a chance before making up your mind. We can usually tell when someone isn't interested; don't waste your time and pretend to like something. Just be interested in learning, regardless of the subject matter and its future relevance to your career.
Don't complain about the hours. You will get little sympathy from overworked, fatigued residents. I still shake my head in wonder at the day I found medical students sleeping in the intern call room complaining that they had "only" 5 hours of sleep the night before. Its a good night, make that excellent night, for me if I get 5 hours (so stay out of my bed in case I want to take a nap). You can sympathize with residents and complain to your friends, but you won't win any friends or awards by complaining about the hours. Remember we are here longer than you are.
Leave when you have the chance - but don't leave before you are told to. It looks bad. It really, really sucks to stay around, especially when you aren't doing anything (believe me, I do a lot of it too), but the student who leaves without asking or just doesn't show quickly buys themself a bad evaluation. Ask and when we say, "get outta here, see ya in the morning", ask once if we're sure and then leave. Don't ask twice - we might change our minds! :wink:
There are many more tips. If I think of them I'll post some more.
Best of luck.