National Museum of Royal Barges
13.761955, 100.484557 = 13°45'43.0"N 100°29'04.4"E
Easily accessible by bus 19, 57, 91, 127, 146, 149, 157, 169, 177. From main road (Thanon Arun Amarin ถนนอรุณอมรินทร์) it's about 300 m walk, with many turns, through a slum. Signs at every turn. The museum has a pier, but no public boats stops there.
Open 9-17 every day, entry 100 Baht, for taking pictures additional 100 Baht.
All explanations are in English and Thai.
The museum seen from the pier (high water level in Nov):
I went with a friend, we spent half an hour in the museum, and there were few other visitors.
When passing on main road, I spotted royal barges on the western side (the museum is on eastern side), and satellite image shows royal barges in the open (the museum I went to is the large white/metal roof, there might be another with the multiple small red rooves/roofs, requires further reseach):
update 2mar2017: the other museum has a website
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