Depends on your needs and preferences. Some like mountains so move to the Chiang Mai area, someone like big cities so move to Bangkok, someone like islands so move to Koh Phangan/Samui/Chang, someone like the quiet, rural areas so move to Isaan, etc.... Noone can answer as long they don't know your needs and preferences... This is like a question how long is a piece of string...
old data.. 7.6% in 2022 and before it was more than 11% so tourism is a significant part of Thailand's GDP.... Since the COVID few hundred businesses closed and are much more homeless than before...
One day isn't a problem. Pay 500 baht. It happened to me a few years ago. I booked the slow boat tour from Chiang Mai but i forget this is the tour which stops at the Thai side for one day... So we crossed the border the next day when my visa had already expired just one day. I apologize and explained what happened. I get the overstay stamp in my passport. And 10 days later I came back into Thailand without a problem and no problem since even I visited Thailand 7 or 8 times in the past 5 years.
the letter from the school for holiday isn't a thing... I never heard anyone's need this and not even my school mentioned this at all... Many of my classmates went on a "holiday" and even left the country and came back) I'm on ED visa myself... So i really want to know where you get this information... 🤔