You said, " If you leave the country before that, the 90 day count down clock stops and starts back up when you stamp in to thailand again." Just to be clear, if you leave and then return does the clock reset or does it pick up from where you left off? That is, does the 90 day reset back to 1 or if, for example, you were at day 50 when you left, does it continue at day 51 when you return?
Also, do you need to take any documentation with you, aside from your passport?
Thanks!
And for everyone else, this date duration calendar may be useful:
**********************************************