We visited Karen Hill Tribe near Mae Hong Son. It was hardly a "hill tribe" and very touristed (although we were literally the only tourists there), however, it was very interesting. The Karen people are also known as the "Long-neck" or "Giraffe tribe".

The Karen people of Thailand are refugees from Myanmar and have no civil rights in Thailand. They are not a "recognized hill tribe". They rely 100% on tourism.

They welcome visitors to their village where they sell crafts that they make. The brass rings that appear to stretch their necks actually weigh down the collar bone and rib cage making their neck appear longer. There are not any known health consequences of doing so.