What are the requirements and costs to extend a 30-day visa in Thailand for an additional 3 months?

If you enter Thailand on a 30-day visa exemption, you can extend your stay for an additional 30 days at a local Immigration Office for a fee of 1,900 THB. After this extension, if you want to stay for a total of 4 months, you may need to consider obtaining a Single Entry Tourist Visa, which allows for an initial stay of 60 days, with a possible additional 30-day extension and then a border run. Alternatively, a Multiple Entry Tourist Visa can provide more extended options. Remember to check with an embassy or consulate for the visa before your travel.