Can Visa on Arrival (15 days, Indian passport) be extended at the Immigration Office and if so for how long? If not, is it possible to just go on a visa run to Mae Sai and get another 15 days?
TLDR : Answer Summary
A Visa on Arrival for Indian passport holders cannot be extended beyond the initial 15 days at the Immigration Office. You can get a 7-day extension application stamp for 1900 baht, but it's not a straightforward extension of the full period. Additionally, a visa run to Mae Sai will not allow you to immediately re-enter for another 15 days, as regulations do not permit this for holders of a Visa on Arrival. Obtaining a valid tourist visa before arriving in Thailand is recommended to avoid complications.