South Dakota uses the U.S. dollar as currency, and most attractions, restaurants and hotels will accept major credit cards. While there are some currency exchanges in South Dakota, some are limited in the types of currency they can exchange. That’s why it’s a good idea to change your money at a gateway airport before you get here. If you plan to use a credit card here, be sure to check with your card issuer before you travel to ensure you are authorized to use it in the U.S.