Definitely get as much face-time with the PD as possible. It was easy for me because I was scheduled to rotate with him (and I think most PDs make an effort to meet you in a similar way). Also, you should seriously consider doing an end-of-rotation presentation of some kind, and you should make sure to do it on a day the PD is there if possible.
Another thing I found worked out well for me, I was rotating about the time I was getting all my ERAS stuff together, so it was quite natural to ask for advice regarding my CV and personal statement. He was happy to look over it and help out, and in the process get a sneak peek at my application. I suppose if your app isn't ready to be seen, that could be a bad thing, on the other hand.
