Thanks, appreciate the info on Ranong.
Someone in that thread talked about hotel receipts. Well I won't have that as I live in my house in Prachuapkirikhan. They all talk about USD10, just as well to know in advance and the cost of the boat (THB100 pp). Hopefully that's all. I haven't done an exit at Ranong for 16 years.
If it's not Ranong then presumably it would have to be Aranyaprathet, or are there others within reach of central Thailand?