Can we travel to Thailand, get visa at arrival, then go the same day to a Thai immigration office in Thailand and extended our stay for 30 more days (for 1.900 Bhat) that we have all together 60 days stay?
TLDR : Answer Summary
Yes, you can arrive in Thailand on a visa exempt entry or visa on arrival, and then you can request a 30-day extension at the Thai immigration office. However, the ability to extend immediately may depend on the specific immigration office and its policies, as most offices typically require you to apply for an extension within 15 days of your departure date. It is also advisable to confirm requirements such as proof of funds and accommodation when applying for the extension.