Told them I was staying at my girlfriends house in Koh tao and they asked to see picture of my wife's ID card. They was pretty reasonable if you already have a flight booked to USA then I can't see you having any problems tbh
it was just basic stuff really I told them I came on visa exempt as getting married before converting visa, they questioned why I hadn't got married while I was here before, I told them I didn't want to travel Bangkok during covid and am doing it now as I am already in Bangkok doing my test and go
I came today from UK on visa exempt ( 30 days) I was questioned quite a bit at Bangkok immigration as I had only left 5 weeks ago and had been here 13 months on Covid extensions but they let me in after 20mins
You need passport size photos copies of passport page copies of tm6 ( the small slip stapled in passport when arrived ) and copies of the page that was stamped on arrival it cost 1900baht