Following is an interesting CCTV9 documentary on travel to through the Miao and Dong area in eastern part of Guizhou. I have seen Miao people while I was in the Huangguoshu waterfall area in Guizhou. Many are also found in Hunan province during my travel to Fenghuang. However, it appears from this documentary that those from the south eastern part of Guizhou are more traditional, and least affected by modernity.
Here is what ChinaTravelGuide has to say about this:
More than 15 minority ethnic groups settled in Guizhou and most of the amazing scenic areas are located in these settled minority areas. In addition to enjoying the scenery, visitors can discover the rich and varied folk customs and cultures of the different minority ethnic groups of the region. Numerous festivals throughout the year, strong but simple and unsophisticated customs, architectures with unique style and the exotic and colorful costumes, will make tourists feel everything is new and fresh.
Lying in the southeastern area of Guizhou Province, Kaili (凯里) City is a living quarter of the Miao ethnic minority. So it is a nice place to learn about the culture and life of the Miao people. However, as a tourist destination, Kaili also boasts its natural landscapes, karst landform and the ancient architecture.