The hospitableness of Thai people is a topic often overheard when listening to tourists talk about how they enjoyed their time in Thailand. The welcoming nature of people in Thailand is something which brings people back to Thailand time and time again, after all Thailand isn’t called ‘The Land of Smiles’ for nothing. In general Thai people are remarkably friendly, but learning a little about the culture will hold you in even greater esteem and will perhaps allow you to benefit from your trip even more.
Note the foot taboos, feet are considered both vulgar and low, so don't point your feet at anyone or anything. Another important point to remember is not to touch people on the head, try not to even pat young children on the head as President Johnson should have been warned. Thais will be pleased if you wai them on meeting, (join your fingers together and with palms touching, bend your head slightly and touch your nose with the tips of your fingers), but you may well find that the reply is an outstretched hand waiting to be shaken. When offered something such as a glass of water, try and receive it with both hands. Try not to pass between two people who are talking, if you have to, make the gesture of ducking slightly. None of these mistakes would cause you any trouble, but do it right and you will earn respect.
And if you really want to go overboard with assimilation, read this hilarious offering from the Ministry of Culture on how to behave in Thailand