Into the city
How the day stops: split the airports on landing, pick one end, and close. Suvarnabhumi uses the Airport Rail Link City Line (a government page says Express is suspended); that ticket is not Rabbit or the Blue Line, and the fare is what the machine shows; Phaya Thai to the BTS is another Rabbit fare, Makkasan to the Blue Line another contactless tap. Don Mueang via Bang Sue, not Hua Lamphong. Keep only the river, Siam, or the old town as the end. Do not start with Chatuchak, and do not bounce to a second airport axis the same day.