If I want to stay 90 days in Thailand, do I need to get a visa or do I get a 60 day stamp when I arrive and extend 30 days when I am there please?
TLDR : Answer Summary
To stay in Thailand for 90 days, you need to obtain a single-entry tourist visa, which allows a stay of 60 days, followed by a possible 30-day extension. Alternatively, if you arrive without a visa, you'll receive a 45-day stamp and can extend for 30 days, totaling 75 days.