Like James Miller said above, passport, O-A visa, check the immigration stamp to be sure its one year, TM-6 departure card, larger hotels file the TM30, if you are staying 90 days or longer you need to file a TM47 stay longer then 90 day. Notification must be made within 15 days before or after 7 days the period of 90 days expires.
thank you very much. So the original year of issue I can go in and out of Thailand no re-Entry form needed. But once the original expiration date arrives, tor I make the first extension then it is required.
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