I decided to go and see the royal barges museum a place where the boats for processions by and for the Thai royal family are kept. To get there I had to take a ferry across the Chao Praya river and then walk it from there. It was a nice walk through an interesting set of alleys and back roads and when I came to the museum it was closed! So I continued my walk and eventually ended back up at my hotel where I bought a newspaper with a lovely picture of one of the barges on the front page.
It turns out the reason they are not on view is that they are being used to train the crew that has to take them out for a procession next month.