The evening flight from Krabi brings us to the 700-year old city of Chiang Mai, over 900 miles north of our previous location and some 3,000 feet higher. With a domestic flight and an airport so close to the centre, it’s a satisfyingly quick transfer and we get from aeroplane seat to hotel room in record time. From Koh Lanta to Krabi, the road trip by minibus, or minivan as it’s called here, had its own dramas, the driver continually pulling off the route to pick up more passengers and luggage even though we seemed already full to bursting. Each time we felt there wasn’t another inch of space, on…