If all you know about Songkran is that it is the world's largest outdoor water fight, you need to read this book to learn the history or Songkran and how it should be celebrated. Thanks to the Tourism Authority of Thailand, this simple holiday of showing respect to elders, honoring one's ancestors, and making merit have developed into an insane 3 weeks in April.
The standard water throwing is suggested as a sign of removing all their sins and misfortune, and it in some cases has actually aromatic herbs included if commemorated in the standard way.