You can exchange traveler's checks or cash at most banks, and most hotels in the cities, the exchange rate in the hotels is the same as that in the banks. To change money, you have to have your passport at hand. If you want to change money in a hotel, you usually have to be a guest there. Sometimes if you are not a guest in a hotel but need to change money there, you can just say a random room number, but this doesn’t always work.