How can I extend my 60-day visa by 30 days in Nakhon Si Thammarat?

To extend your 60-day visa for an additional 30 days in Nakhon Si Thammarat, you should visit the immigration office near the airport, fill out the required form, and pay the necessary fees. Make sure to copy every stamped page from your passport as a part of your application. It's recommended to go at least 30 days before your visa expires and consider using a Grab taxi or motorbike for transportation, as public transport may not be available.