Unpopular opinion: Bangkok was NOT a city I enjoyed. Why in comments.
Khaosan Road
Urban area known as resting place for backpackers, with various types of lodging, plus shops & bars.
Ayutthaya Historical Park Office
Archaeological site with 14th-century remains of the former capital of the Kingdom of Siam.
Damnoen Saduak Floating Market
Floating market place featuring vendors in wooden boats filled with goods & souvenirs for sale.
Chiang Mai International Airport
Airport offering domestic flights & service to destinations in Asia, plus business lounges & more.