Actually, I would suggest that you do tip for room service. It is not required and they won't have their hand out, but since they are performing a special service a dollar or two is greatly appreciated. There is often an additional charge for special exercise classes like Pilates, and there is an expectation that you tip the masseuse, hair stylist, etc. for such personal services. Be aware that a tip is already added to any bar service (including wine purchases at dinner) so do not tip extra. Hope those tips help - If I think of any others I will share them.