TM30 question: I will do a visa run and on returning to Thailand, stay in Khon Kaen one night before returning to CHIANG MAI. How does Tm30 work in that case? Do I need to make sure that my hotel in Khon Kaen fills out the TM30 so that I don't have a problem in Chiang Mai? Do I need to get a receipt? I have heard of people having trouble when hotels say they complete the Tm30 and actually don't. But I don't know how Chiang Mai is treating a case like this, and their 24 hour rule for the TM30 when staying in another city before returning to Chiang Mai. Any advice?