All new arrivals are required to fill in document forms after landing, in order to be used as contact evidences.
For foreign tourists, Visas and travel documents are extremely important. If you don’t have an arrival Visa, you can ask for one at the arrival counter by using two 1-inched photos and 300 Baht as service fee. But if you don’t have any photo, that’s find. You can use photo-taking service there. You just pay for 120 Baht and you will get 4 photos.
Now, here are the names of countries under the consideration of 15-days approved passport. Fifteen days are probably enough for your vacation. You may not stay longer than that. Let’s see which one is your country. ( Bhutan, China, Cyprus, Czech Republic, Estonia, Hungary, India, Kazakhstan, Latvia, Lichtenstein, Lituania, Maldives, Mauritus, Poland, Saudi Arabia, Slovania, Slovak, Taiwan, Ukrane )
If your country is not on the list, that means your passport book may allow you to stay in Thailand longer than 15 days. You can visit the website www.chiangmaiairportthai.com to check another lists and see if there is the name of your country.