Anatomy elective, make your own hours and learn (relearn) a ton.
Radiology was good, i'd do MSK rad and maybe spend a day w/ the CXR guys so you can get the basics you'll need for intern year.
anesthesia would be nice if they let you go early. maybe go in and get some intubations or lines placed and leave by 10am at the latest. if you have to stay any longer it's a waste of your time.
