Don’t show disrespect towards the Thai Royal Family.
Don’t cross your legs when you are in the presence of a monk. This applies whether you are sitting on the floor or in a chair.
Don’t touch a Thai woman without consent. Despite the image portrayed in some bars and clubs, the majority of Thai women are conservative.
Don’t be overly affectionate in public. This has changed in recent years and younger Thai couples can be seen holding hands, but snogging your boyfriend or girlfriend in the middle of the shopping mall won’t win you too many friends. As with many things, Thais know that behaviour in the West is different to Thailand so you won’t be chased out of town for holding hands with your partner, but resist the temptation to do so inside temple grounds.
Don’t sunbathe nude. This is offensive to most Thai people although nobody is likely to say anything to you if you do so.
Don’t worry too much about whether you should wai (palms pressed together in prayer-like fashion and the head is lowered) or not.
Don’t touch a Thai person’s head or ruffle their hair. Apologize if you accidentally touch somebody’s head. There are exceptions to this standard of behaviour; for example, it doesn’t apply to lovers in the privacy of their room. Thai people will also sometimes pat a child on the head, but as a Westerner it’s best not to do this to any child to prevent any embarrassment.
Don’t place your feet on the table while sitting, don’t point to anything with your feet and don’t touch anybody with your feet.
Don’t raise your voice or lose your temper; try and be jai yen.
Don’t be offended by questions about age, marital status or what you do for a living.These are subjects that will often come up in small-talk. Of course, you don’t have to answer (especially the question about age), you can just smile and just say it’s a secret or ‘mai bok’(‘not telling’).
Don’t take Buddha images out of the country. Strictly speaking it is against the law to take or send Buddha images out of the country unless special permission has been granted. However, this doesn’t mean that stores won’t sell them to you. They will sell them to you, butwon’t necessarily tell you about the regulations.
Don’t overstay your visa.
Do respect all Buddha images. Buddha images are held sacred and sacrilegious acts are punishable by imprisonment even if committed by foreign visitors.
Do dress properly when visiting a temple.
Do remove your shoes before entering a temple, somebody’s house and even some shops.
Do treat monks with the highest respect.
Do try and keep calm no matter what the problem or provocation may be.
Do eat with a spoon. Use the fork to load food on to the spoon.
Do lower your body slightly when passing between or in front of people.
Do try and learn a few basic phrases in Thai, like ‘hello’ and ‘thank you’.