I haven`t known Khon Kaen. I am looking at google maps and it`s quite far away from Bangkok.
I am going to Bangkok next month. Me and my brother want to make a trip a bit to north of Thailand to see how does it look in Thailand not just in Bangkok. But we don¨t have much time there.
Have you visited some other country except Thailand? It looks that Khon Kaen is close to Laos