I spend a lot of time eating. So much so that I often create maps of cities where I spend a lot of time to find where I want to eat. Here are my maps and some that I have found made by others.
Chiang Mai (I only used it to find street carts in old town, the other suggestions are suspect.)
I also use a lot of local blogs to find things. Here are the ones I’ve enjoyed reading and using thus far. They usually have a clear rating system with easy to follow directions or addresses and can be searched by city. Let me know if you find anything similar to this.