Bangkok concentrates the Grand Palace and Wat Phra Kaew, the Chao Phraya river's express boats, Chinatown's Yaowarat street food, and the Damnoen Saduak floating market 100km southwest in Ratchaburi.
Cool dry season with Bangkok at 28°C, Loy Krathong floating-lantern festival in November, and Chinese New Year fireworks over Chinatown in late January-February.
Songkran Thai New Year mid-April brings water-fight street parties to Khao San Road and Silom, with Bangkok's biggest celebrations along the Chao Phraya river.
Hot dry season with Bangkok hitting 38°C and humidity, but Siam Square shopping malls and Chatuchak weekend market stay cool, and Songkran in mid-April.
Wet season with afternoon storms, Vegetarian Festival in late September-early October across Chinatown, and Bangkok's MBK and Iconsiam malls air-conditioned escape.