What documents and steps are needed to extend a visa exemption by one month in Chiang Mai, Thailand?

To extend a visa exemption in Chiang Mai, you typically need to provide a signed copy of your passport data page, entry stamp, and TM6 departure card if issued. Additionally, you must fill out form TM7 and provide a passport photo. The fee for the extension is 1,900 baht. It's advisable to apply for the extension well in advance, though the exact timeframe may not be strict. You might also wonder if they make copies at the office or if you should bring your own. Importantly, there are no rules against repeatedly extending your stay through this method, as long as you leave for a nearby country like Cambodia or Vietnam between extensions.