This is up around Mae Hong Son a couple of years ago. It's beautiful up there, nice and cool too, relatively speaking. Lots of Burmese, Chinese, all kinds of hill tribes, a real melting pot. Temples Thai, Lao and Burmese style, one with a swell museum. I recommend it, but you must fly. The bus is a tortuous eight hours from Chiang Mai, death by a million turns!