• Nationals from 39 countries can now stay in Thailand for up to 30 days without an entry visa. For visitors from other countries, transit visas valid for 30 days of tourst visas valid for 60 days may be obtained at any of the 23 designated immigration checkpoints including the four international airports at Don Muang (Bangkok).
• Documents required for visa's application are: valid passport visa application form completely filled in, confirmed air ticket, one recent photo (2 ? inches) and application fee of 200 baht for transit visa or 300 baht for tourist visa.
• A tourist who wants to have his visa extended must apply to the Immigration Bureau with the following: passport with a photocopy, one photo, a 500-baht extension fee and the medical certificate (In case of being sick).
• If you overstay your visa, the penalt is a fine of 200 baht for each extra day, with a limit of 20,000 baht

Special thanks! for information from "The extensive tourist information"