I've never been to Thailand, so...
the best Thai food I've ever had was yesterday on the way to Jackson, WY on Idaho state route 30 (that's right, I said Idaho). It's on the east side of Lava Hot Springs, ID (that's right, ID) called Riverwalk Thai. The chef is a fellow somewhere between 60-600 and definitely knows what he's doing. I've had Americanized Thai food all over the west, this is, I would say, authentic and outstanding. You'll have to ask for spice though. Did I mention it was in Lava Hot springs, ID?