Buddhist monks should be treated with great respect, as Thai people hold them in such high regard that there are laws protecting them.
If you are invited to someone’s home, it would be polite to bring them a small gift of flowers or chocolates, though you should avoid marigolds, lilies, or carnations, as these have an association with funerals.
In Thailand, gifts will almost never be opened in front of the person presenting them, but rather in private later, so if you are given a gift yourself you should act in the same way.
