How and where to change Bhutanese money, especially when we arrive at the airport?
In fact, you can do it upon arrival in Paro, or in your hotel. It is very convenient for you to change to local money in your hotel than in the bank, but the rate may not be as good as in the bank. If you have saved the receipt for monies changed, you can also change back to US$ or currencies used in the very beginning if you go to the bank. Anyway, you may always change some small currencies in case you need to buy something.