I visited here on my first full day in the city. It it situated very near to the Royal Palace gardens, which are just alongside the river. The museum is difficult to find because it is poorly signposted and it took me some time to get my bearings and I inadvertently walked past it twice. However, if you have the palace in front of you with the river behind you, walk to the right and take the first turning on the right. Walk along this rad to the next junction where the museum is on the left.
As a foreigner I had to pay a $10 entrance fee. The museum is full of artefacts from about 10th - 14th century with art, sculpture, carvings and scripture. Some of the exhibits are local while others are from different parts of the country. Some of the objects are stunningly beautiful, especially a large carved wardrobe with was situated just behind a door in a room filled with statues of Buddha, where people have the opportunity to pray and pay their respects. The wardrobe was wonderfully decorated, symmetrical and probably worth a small fortune.
There are signs around the building clearly saying "no photo's" which were being ignored by many visitors, mainly European ones, who had their mobile phones out snapping everything in sight. So disrespectful. I was there for well over two hours. You can get an audio guide, for an additional charge, although I opted not to have one. Some of the objects however are poorly marked with just labels on them indicating where they were found and their possible age, so its probably best to get a guide if possible. However, the objects were marked in English, which was helpful.
There is a small cafe in the middle concourse selling hot and cold drinks as well as souvenirs including scarfs, books and toys for the children.
Overall, I thought the visit was worth it, although I begrudged having to pay the entrance fee as a non-national. However, while I was there working were doing repairs to some parts of the building so scaffolding can be seen.