Do learn to greet properly people with the traditional wai (the hands positioned on or below the nose depending on whom the wai it is addressed to).
Do take off shoes when entering a person’s home or a religious site.
Do bow slightly when passing in front of or between people conversing as an apology for the inconvenience of interrupting them.
Do not touch people on the head, especially children, as it is considered rude.
Do not criticize the Thai monarchy, religion or the religious establishment as it is considered very offensive to Thai people and can even be considered a crime.
Do not raise your voice and show anger in public.