1. Can a Monkey receive treasure (items and/or money) if another Hero picks up a money or treasure marker?
2. Can Heroes pass money to Monkeys when adjacent?
Money can never be passed, so I don't see why the heroes should be able to pass it to monkeys.
3. Can Heroes pass items to Monkeys when adjacent?
I can't think of an official rule about this one, but I think that they can.