Charge as many places u can with your credit card , hopefully u have a good card that does screw u over with exchange rates ... this will give u actual record of your spendings ... almost every place in Thailand will use "" scan "" ... look into it ...
I booked a round trip flight with EVA LAX to BKK last year February, I don't really want to return but I would lose the flight back if I didn't , they offered a refund on my return trip but it was way too little from what was paid ... so I'm going back to do texes ect and coming back asap
Tell her to come in to Thailand with her Thai passport... less headaches... can stay as long as she wants without visa ect ... if she comes in using her foreign passport she will need to pay for extended stay and visa
Go to YouTube .. type in Hua Hin maybe Hua Hin beaches ...
I've been to Jomtien , Pattaya, Rayong , Bang Saen , Sericha ... all have tons of crap ... most Hua Hin beaches looks like they are swept daily with white fine sandy beach ..
One thing I know about Thailand ... Thailand has everything u want , you just need to look at the right places, imported items may cost a bit more but it's all here ... it might even be cheaper since u don't pay that much taxes on most items here .:. Buy it when u need it , don't need to bring anything
Forgot to add , I also have a Thai passport, but I just got my new USA passport and wanted to fill my pages with many immigration stamped like I did my older passport... paid the price for playing stupid games ..