New York City
Looking for places that are all locals in Bangkok, Chiang Mai and Phuket. Suggestions about any must order dishes also appreciated! We're not shy about eating "weird" things either. Bourdain's recent Chiang Mai episode opened my eyes to the potential deliciousness of blood soup...
Chiang Mai: great food at the Sunday Chiang Mai Walking Street in the old city. My favorite area is just off the main street. I think it's the right after the little shopping mall. I've had some great noodles there, and someone sells local wine. Walk up the main street, and on your right in front of a temple (that has an awesome Sunday food court) you'll find the best mango and sticky rice that I have ever eaten. The area around Warorot market in Chinatown also has some great street food. Walking Street is good on Saturday night, too. There's a large outdoor eatery at Chiang Mai Gate. I recommend the smoothies. I think the lady's name is Mrs. Pa (that's a guess!)
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I absolutely agree with Nancie M. In addition, and I don't know if this is the answer you're looking for, pretty much anywhere in Thailand is going to have great street food. Thais are passionate about food and every neighbourhood you'll encounter will have great vendors - this includes rural areas - you'll find someone, somewhere. I'd also suggest markets (meaning outdoor markets where Thais pick up their groceries). Markets also include vendors selling a variety of dishes - both national and often regional.
Check out Mark's website, http://migrationology.com for some great eats in Thailand