If you want to get started with city bus in Bangkok those routes are easy and useful in Kao San Road area. They will lead you to many major shopping malls: MBK center, Siam paragon, Central World to name just few. Jim Thompson’s house museum, Bangkok art & culture center are also nearby.
You will use bus number 15 or 47 (red-cream) from:
You will know when to take off the bus when the sky train is over and skyscraper are all around .
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To get back just take the bus on the opposite side of the street where you took off.
You can take off the next stop after democracy monument, usually many peoples get on and off at this stop. If you pass it when you use bus #15, the bus loops in the area.