What do I need for a 30-day visa exemption or visa on arrival in Thailand?

To get a 30-day visa exemption or visa on arrival in Thailand, it is important to know your nationality, as only citizens from certain countries are eligible for the visa exemption. If you are from one of the 51 countries that qualify, you typically do not need any specific documents at the time of arrival, but it is advisable to be prepared to show proof of funds (10,000 baht), proof of onward travel within 30 days, and proof of accommodation (hotel booking). For those who do not qualify, a visa on arrival may be applicable, which has different requirements.