I am Thai..actually in Thailand there are lots of tradition holiday, but I think the one that is the most famous is "Songkran" which begins on the 13th April and ends on the 15th April. For original version, we will wake up early in the morning to go to the Wat or monastery belonging to our village or district to offer food to the monks there.
In the afternoon is bathing ceremony of the Buddha images and also of the abbot of the wat after this begins the well-known "water throwing feast". The bathing of images is done as ritualistic ceremony, but it is no other than a New Year's purification. Younger people will also on this day or the succeeding days go to pay their respect to and ask blessings from their elders and respected persons.
For me this is also my favourite holiday cause I could go back to see my grand mother and other relatives in my home town..and then the best part was water throwing feast..I went out with friends and cousins on an open cart with big tanks and water balloon bombs (the small one ) and the time to flight as you see in the pics