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Ban Kamthieng is a 19th-century ancient Thai stilted teak house where you definitely wouldn't expect it: right in the middle of Bangkok's high-rises. It was transported from Chiang Mai in pieces and assembled in Bangkok in 1964 to function as the headquarters of the Siam Society, an organisation that has the goal of preserving the cultural heritage of Thailand. Beside the house itself, on display are traditional tools, arts and crafts used by Lanna farmers and fishermen from northern Thailand in olden times, as well as a large selection of Thai flora in its yard. There is a heavy focus on the cultural heritage of northern Thailand, as that's where the house and most of the tools on display came from. The only downside of the museum is that it's quite small, so don't expect to spend here longer than 30 minutes (or even 15 minutes if you're quick).
When the Thailand Tobacco Monopoly moved all its factory operations to Chiang Rai in 2008, the lake and some adjoining land that were part of its compound, previously enjoying semi-wild vegetation, were turned into a public park. Many splendid old rain trees were cut down in order to landscape the park, in which young trees were planted instead. Adjoining the Queen Sirikit National Convention Centre, it is a neat park with dedicated cycling and walking paths, fixed exercise equipment and several monuments.
Museum of Thai Eroticism
According to its website: "Massive collections of Siam erotic art that will blow your eyes." Make reservation one day in advance. The founder's son has a more modest exhibition at his Green Lantern Cafe on Soi 55.
Middle East Street
See the mingling of Arab and Thai cultures in this dense Arab neighborhood by Nana station. The area is flush with tourists from across the Arab world. It's interestingly filled with shops for two things: agarwood, an expensive wood burned as incense in the Middle East, and Arab sandals.
Part of the reputable Health Land spa chain. Offers foot reflexology, traditional Thai, therapeutic and aromatherapy body massage.
Head spa & massage salon, the only head spa in Bangkok where head spa, full body massage and facial can be combined in one treatment.
A mix of expats and locals play together at this chill hangout with a wide variety of board games, as well as snacks, coffee, tea, and juice.