What documents do I need for a 30-day visa extension in Thailand and how do I get to Chang Wattana?

To get a 30-day visa extension in Thailand, you need to bring the following documents to Chang Wattana: a filled out TM.7 application form, one passport-sized photo, copies of the data page of your passport, your visa (if applicable), your entry stamp, and the TM.6 departure card. The fee for the extension is 1900 baht. For transportation, you can take a taxi or a 25 baht mini-van from Mo Chit to the government complex where the immigration office is located. Using the tollway by taxi is recommended for quicker access.