Two quick visa(free) questions:
1. Arriving visa-free with the initial 30 days, is it indeed possible to add another 30 days at an immigration office (e.g. in Chiang Mai)?
2. If then exiting to Laos or Cambodia for a bit, is it possible to return with another 15 days crossing overland?
Trying to figure out if it's worth getting the 60 day (90 extendible in-country) tourist visa or if visa-free would suffice.
Information online is all over the place about this and everything else Thai visa related.
TLDR : Answer Summary
1. It is possible to extend a visa-free stay by 30 days at an immigration office in Thailand.
2. Upon exiting to Laos or Cambodia and re-entering, travelers will receive a new 30-day stamp at the land border, not 15 days. However, the ability to re-enter via a land border is limited to two times per calendar year for visa exempt entries.