I imagined this would be an easy queston to answer, I was wrong.
I want to spend 90 days in southeast asia. I want to use Bangkok as my arrival/departure city. As an US citizen I may get a 30 day tourist visa upon entry. For 60 days I need to apply for a visa before departure. But with a departure date 90 days past my arrival in Thailand what visa(s) do I need to apply for? How do I prove i'm not spending all that time in Thailand? Am I going to be forced to purchase a flight from Bangkok to Hanoi (for example) as proof of my leaving Thailand within my 90 day stay in sotheast asia?
Sorry if this sounds confusing.
P.S.- I've heard that when entering Thailand, as long as you look presentable, it's not a big deal. It's the airlines that won't allow you to board without proper visas.