The Thais love their King. Remember this and act accordingly.

Don't raise your voice or show anger. This has to do with face and if you cannot control yourself you will look like the ignorant tourist you really are.

Don't hurt anyone especially a Thai. You will be held responsible and you really do not want to have to deal with the Thai police. It will cost YOU.

DO Smile A LOT and enjoy your trip.

Anyone else have suggestions in this vein, please feel free to add comments. They are most welcome.