Another big help we can do when we stay at the hotel is to turn off all the lights and air-conditioners if we leave our room. Some people reason out that they want to get back into their room cold right away. But think of the energy we waste as we go out for many hours. Our little discomfort cannot surmount the suffering we will have in the future if we don't do something NOW to protect our environment from destruction.
I'm glad to see the hotel we stayed in Chiangmai in the north of Thailand for using automatic key-card. Many hotels are using it now so that when the customers go out, they need to take their magnetic key not only to lock their door but also to turn off the energy source right away. It's beneficial to both hotel management for saving energy and to the environment as well.