Rio offers the same facilities as any other big city in the world. There`s no need to travel with a large amount of cash. Credit cards are largely accepted in most places including some street markets. Nowadays many places also accept the debit cards if you don`t want to use much of your c/c.
Us dollar is also accepted by most shops, so for a short time period in the city, there`s no need of exchanging money. There are several ATM machines spread in the city for international cards. You can use at the airport or check with the hotel concierge to find the nearest one to you. The exchange shops usually use a better rate, but they are open from Monday to Friday only. To exchange money on the weekends you need to do it at a hotel.
This tip is provided by supplier M06018