I was wondering if anybody knows anything about doing rotation in canada? I'm in first year medical school in PA, a canadian citizen, but I would like to do my rotations especially for 4th year there.

Try premed101.com/forums, there's a bit of information about this there. Not quite sure which section it is under though.

you can do MS4 rotations in most places, but you need to start EARLY to set up the paperwork etc.. Some places require ridiculous med stuff (like varicella titer, which is not even indicated). Some places will not take US students (even if Can citizen). Most require you to apply at least 3 or more months in advance. I looked around on the websites of different universities and found my info that way.