Do:
Say "Sawasdee Krab" for men or "Sawasdee Ka" for women when greeting Thai people.
Perform the 'Thai Wai", a slight bow with the palms pressed together in a prayer-like fasion, while saying "Sawasdee Krab" or "Sawasdee Ka".
Use "Khun" as the honorific title before a person's first name .
Always respect the elders. If someone is older than you, address them as "Pee" or "Nong" if they are younger.
Speak softly and smile warmly.
Respect the places and dress appropriately when visiting temples and religious sites.
Always treat any image of a Buddha and Buddhist monks with extreme respect.
Always ask for permission before taking pictures of anyone.
Avoid kissing or hugging in public.
Remove shoes before entering a Thai home.
Try to learn a couple of Thai words and phrases.