1. Carry a couple/few inpatients in a "junior resident" role. Write good notes, be incredibly on-top of your patients (know their meds, their current mental status, etc) and present them well in rounds (take the initiative - with your resident's permission of course). It'll leave a mark.
2. Offer to help. Residents are often overworked. Offer to help them out. Usually they'll decline, but remember the offer.
3. When they tell you to present a disease or concept, do it well. Look up an article or two and provide a 5-10 minute nice summary of a disease process, condition or fascinoma.
4. Meeting with the PD is a great idea. They'd rather take someone they know is genuinelly interested and good than taking a chance on an outside person that looks good on paper and can hold it together for a 20 minute interview. Be frank with the PD. If your rotation spot is one of your top choices, tell them.
5. Bring in bagels one morning (with butter and cream cheese). You can do this on your last day to invoke the recency effect.
6. Dress well but not "too well." Look professional all the time.
7. Offer to do a call if it's not required.
8. Be friendly and generally helpful. You'd be surprised how many aren't.