The Suan Pakkad Palace was actually home to a Prince and Princess, who took their family's heirloom houses from Chiang Mai and reconstructed them in Bangkok. There are now eight traditional Thai houses on the property, along with a royal barge and a lacquer pavilion. In the houses, the family's collection of musical instruments, Asian artifacts and household items from all over the world are on display. There is also a museum where pre-historic artifacts found in northern Thailand are on exhibit.
Guided tours are available. The whole place can be seen in an hour or so.
More here: http://whyhellomel.blogspot.com/2013/02/suan-pakkad-palace-bangkok.html