Etiquette in Thailand is mostly invisible until you break it. Greetings, gestures, dining manners and the social cues locals expect are worth learning before you arrive.
In Thailand, etiquette comes down to a few things: the wai greeting, stay cool — literally, and dress for temples.
Press palms together at chest height with a slight bow. Higher hands = more respect. Don't wai to children or service staff. They'll wai you — smile and nod in return.
Tip: The head is sacred, feet are the lowest. Never touch someone's head or point feet at people or Buddha images.
Losing your temper in Thailand causes you to lose face more than the other person. Stay calm, smile, and resolve things quietly. Raised voices are deeply uncomfortable.
Cover shoulders and knees at temples. Long pants or a sarong and a t-shirt work. Some temples provide coverings. Shoes always off.