I’m a US citizen. I got my visa on arrrival and it expires tomorrow the 15th
1) can I extend my visa on the last day of the visa being valid
2) do you recommend the pai, CM, or CR visa office ?
TLDR : Answer Summary
A US citizen with a visa that expires tomorrow can apply for a 30-day tourist extension at the immigration office on the last valid day. It's important to go to the office that corresponds to your TM30 registration, which is based on the address where you're currently staying. It's recommended to check with your landlord for their TM30 receipt before visiting the immigration office. While it's possible to apply on the last day, there is no penalty for doing so earlier.