To me the best and easiest way would be to visit Ayutthaya from Bangkok after arriving from Chiang Mai, and I also think the easiest way to go to Kanchanaburi would be from Bangkok, although you might find a way that I don't know about to go directly from Ayutthaya to Kanchanaburi.
My 'specialty' is Kan'buri info, and you can get there from the southern bus terminal in BKK. Air-con buses are leaving every 15 minutes, takes two hours, price about 115 Baht. Make sure you are buying tickets at the blue counters (the orange counters are selling tickets for non air-con buses). |