Hello! I come to Thailand without a visa Prior and got 30days visa stamp upon arrival, and now the visa is about to expire in 3 days but i would like to stay in Thailand for alittle more for the Loy Krathong. So i was wondering if I can do visa extention? I havnt done that before, and eventuelt what I need for it? What paper? And which immigration office (I stay in Bangkok)? And what do I need to know. Or do i need to do visa run? And eventuelt how people do the visa run here in Thailand? Usually when I stayed in Korea, i just do visa run to Thailand/Japan for a few days, but here when i try to look up there is more different than what I am used to, as there is all sort of bus/train to cambodia and Laos.

Ps: I am a Norwegian citizen