Do take your shoes off when entering a temple or any residence or business establishment unless you are instructed to do otherwise.
Do not wear shorts in temples and try to wear shirts with sleeves.
Do show patience with Thai people who speak English. They are speaking a foreign languare in their country. How may languages can you speak Fluently?
Do not raise your voice, argue, or swear when talking to someone.
Do not say anything derogatory about the Royal family.
Do not touch the head of children.
Do not kiss or hug your partner in public