I saw someone mentioned Khon Kaen (KKC)! Haha!
Too bad I ain't going up this year, only the wifey.
Only advice that I can give u if you are driving is to be extra careful during the Songkran period. Drink driving fatalities run in the hundreds, if not the thousands.
I remember when KKC didn't have any taxi companies... getting around was a pain in the @ss!