It all depends on the mousekeeper you get. Some are very friendly and some won't even say hello to you. Depending on the length of our stay we usually give $5-$15. A friend of mine who is at WDW said that the amount we give is fari being most people don't give anything but they are really not allowed to take any tips and are suppose to turn in any money left in the room. We usually put it in an envelope or card for the mousekeeping person.