Make your own way to Chiang Mai's bus terminal in the early afternoon and board your bus to Mae Sot. You'll arrive in Mae Sot in the evening and our driver will pick you up and take you to a guesthouse by songteaw where you'll be spending the night (expect basic shared accommodation).
Transportation: Chiang Mai to Mae Sot by Bus, Mae Sot Bus Station to Mae Sot Guesthouse by Songteaw
Accommodation: Mae Sot Guesthouse