What documents are required for a 30-day tourist visa extension in Thailand and are there multiple immigration offices in Bangkok for this purpose?

To extend a 30-day tourist visa in Thailand, you may go to any immigration office that services the address you are using. Each immigration office in Thailand corresponds to a specific area; for example, the main immigration office in Bangkok will only process applications using a Bangkok address. The documents typically required for the extension include your passport, completed application form, and a fee, along with any other necessary supporting documents. It's important to note that various immigration offices can handle visa extensions outside of the main office in central Bangkok.