Nope the only way you’ll get to stay any longer is by leaving the country and re-entering, if you don’t have an extensive history of doing this you’ll have no issues but some borders will expect you to spend at least a day on the other side of the border so some research into your preferred exit point will be needed if you want to avoid this.
Your visa exempt entry(30 days) cannot be extended more than once, same for the tourist visa(60 days). Your only choice is to leave the country and enter again under a new entry stamp
nope it’s 30 days, same for your friend that came on the 1st the day you enter is included as the first day so sucks if you come late in the evening at like 10pm as your first day is two hours for example but they are the rules 😁
Honestly if you’re planning on coming back soon it’s a long wait in the departure lounge, as long as you are there before midnight may 31 you won’t get an overstay stamp.
You’ll get the fine waived as it’s only one day but the stamp itself can sometimes give trouble, chances are they’ll let you through with a one day overstay but might make it a bit longer when you get to the immigration line
For the actual tourist visa you will need to leave the country and apply at an embassy/consulate for the visa, I usually use Kuala Lumpur in Malaysia but you need to book an appointment in advance here. The process can take
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days it is not like the border bounce.
The other option is doing a border bounce, some borders you will be able to exit and re enter the same day some you will have to spend the night or two on the non Thai side and then extend it for another 30 days at your local immigration office for 1900 baht, essentially giving you 60 days.