In 2026, it is generally better to pay in colones (C) for small, everyday purchases in Costa Rica. While US Dollars are widely accepted in tourist hubs, hotels, and for large tours, using local currency for "sodas" (local diners), public buses, and supermarkets ensures you get the fairest price. When you pay in USD at a local shop, the merchant often uses a "simplified" exchange rate that is 5-10% worse than the official bank rate, and you will almost always receive your change in colones at that disadvantageous rate. For 2026 travelers, the best strategy is to pay for your accommodation and car rental in USD (using a credit card with no foreign transaction fees) but use colones for everything else. ATMs throughout the country allow you to withdraw both currencies; just be sure to choose the "Colon" option for daily spending to avoid the "tourist tax" hidden in arbitrary exchange rates offered by street-side vendors.