The Thai Kabob (TTK), Pai
As a backpacker town, Pai is full of non-white eateries catering to westerners. The Thai Kebab (TTK) is among the best of these, so when you've had your fill of pad thai it's a good place to stop for a great, inexpensive lunch or dinner.
Try the Falafel special with Thai iced tea or coffee, a solid lunch combo.
($) - $3 and up
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