Note that US citizens can obtain a visa on arrival in Thailand and dont need a visa for tourism unless you plan on staying for more than 30 days or seeking employment. With visa rules changing all the time it would always be best to obtain a visa before you arrive in Thailand. As an example if you are going to Thailand via Cambodia on a backpacking tour you will only receive 15-30 days at the land border. These rules are always changing so best to be certain.
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