Are credit cards and US dollars accepted in local businesses?
Yes, in general, although it is better to verify Credit Card acceptance prior to payment for goods or services (VISA, MasterCard, Amex, Discover). U.S. dollars are accepted everywhere, though it is better to bring small denominations ($20) for ease of payment and exchange to Costa Rican colones. Paying for goods or services with $100 bills can be problematic. They are generally accepted only at large business establishments.