Do the Right Thing.

Something that has stuck with me from the military. I can't tell you nor anyone else what to do when nobody else is looking. Do what is going to allow you to sleep at night.

I wouldn't want to be in the situation either, but I think I'd start by having an honost talk with the landowner about your Conundrum. He may value your ethics as much as you do. Either way its your decision ultimately - noone else will be looking.