The BTS Skytrain (รถไฟฟ้าบีทีเอส rot fai fa BTS, pronounced bee-tee-et)
deserves a visit simply for the Disneyland space-ageness of it. Built in a desperate effort to ease Bangkok's insane traffic and pollution, the Skytrain covers most of downtown and is especially convenient for visiting Siam Square. There are two lines: the light green Sukhumvit Line travels along Sukhumvit Road, Siam Square and then follows Phahonyothin Road up north, where it terminates at Mo Chit (N8), near the Chatuchak Weekend Market. The dark green Silom Line starts in Thonburi, passes the Express Boat pier at Saphan Taksin (S6), goes through the Silom area and ends at National Stadium (W1), right next to MBK Center. Both lines come together at Siam (CEN), where you can interchange between them. Unfortunately, there is no station near Khao San Road, but you can take the Express Boat from Phra Arthit Pier to Sathorn Pier, where you can switch onto the Skytrain.