Simple -- my Rolleiflex 2.8F. One does not want more than one lens on a desert island, anyway -- changing lenses is just an opportunity the the Swedish Women Beach Volleyball Team to accidently kick sand into your camera.
(I assume one would not be exiled to the desert island all alone!LOL!)
Oh...and TMax100, unless I was contacting the negs using alt processes -- then I would go with Tech Pan. (or is it only the TMax sheet film that has the UV blocking layer?)