THINGS TO NOTE WHEN EXCHANGING CURRENCY IN THAILAND:
Currency exchange can be done at the bank however the rates may not be as attractive as offered by local money changers.
Customers are required to present their passport at most money changers to change their money.
Bank Money Changer booths are available on every levels of Suvarnabhumi Airport while local money changers are available at the basement level.
There are several bank money changer booths at Don Mueang Airport at both Arrivals & Departures areas of Terminal 1.