Rates vary from one place to another, but it is worth noting that the airport is the first place you can but the last place you should change your money. There are several money changers located in the city centers of most of the Emirates. They tend to only deal in cash but their rates (sometimes without commission) can be lower than that of banks, particularly if you are exchanging a large sum.
Travelers’ checks are accepted with ID in banks, hotels, and other licensed exchange offices affiliated with the issuing bank. Exchange houses make a profit on the difference between the rates at which they buy and sell.