A lone walker crosses the footbridge over the river Pai in the early morning. For three days I woke up in Pai with mist surrounding my cottage and the nearby buildings of the town and hovering over the river. Set in a low valley, Pai doesn't see the sun until well after nine, and even then it doesn't really get hot until noon. But when the sun is high, Pai temperatures – even in January – can push above 100 degrees.