A nightlight, wouldn't help, since there are no plugs in the bathroom, except for an electric shaver. We just left the light on and closed the door. There is a crack under the bottom of the door, so it really works well as a nightlight. Yes, you can bring disposable razors of any kind, these don't have to be checked, you can place them in your carry-on if you desire. The carry-on must be the same size an an airplane carry-on, since it must fit through an x-ray machine. As to wearing shorts, I guess it depends on what the weather is where you're coming from. I HATE being cold on a plane, maybe pack them in your carry-on and change at the airport or at the pier, if you don't want to wear them on the plane.