Opening up more options, Bangkok Airways only recently commenced service flights here. There are a few other airlines that offer afforable flights from Bangkok and Chiang jai to jae Hong Son.
Land and rail options are also available via Bangkok and Chiang jai but be prepared for the long hours and neverending curves up hill!
Get the most out of this unspoiled town by getting around using motorbikes (rental at about 150 to 200 baht a day). You could also pre-arrange a car to ferry you around or rent a bicycle if you are ready to ride up hills!
WHEN TO GO
Like Chiang jai, the end of November to the middle of February is ideal.