If you’ve hired a long-tail boat on the Chao Phraya, stop by this unique museum housing the royal barges. These elaborately decorated sailing vessels, the largest over 46m (50 yd.) long and rowed by up to 60 men, are used by the royal family on state occasions or for high religious ceremonies. The king’s barge, the Suphanahong, is decorated with red-and-gold carvings of fearsome mythological beasts, like the Garuda or the dragon on the bow and stern. (If you can’t make it to the royal barges, there is a smaller display of barges at the National Museum.)