"The regions of Thailand are unique within themselves, this comes with different foods, cultures and even languages, providing tourists with a feeling of well-roundedness after their trip. For example, the Northern region (i.e. Chiang Mai) is historically tied to South Asia and has cooler weather, so the dishes up there tend to be milder, less spicy and with a more Indian flavouring, such as Khao Soi. There are multiple famous Khao Soi restaurants in Chiang Mai and in the past I have spent the day with friends travelling from restaurant to restaurant in order to try them all (finished very full but very satisfied). Ironically, the flavour palette of each region reflects the stereotypical personality of it also, as Northern people are generally perceived as milder and more mellow than most.
Otherwise, Chinatown in Bangkok has grown in popularity, with one famous street food vendor called Jay Fai being the first vendor to gain a Michelin star (she is on a Netflix show called Street Food Asia!)."
Peem, Travel Counsellor