Most shops, restaurants, hotels, and B&Bs in Cape Town take credit cards, but you need cash to buy gas. Don't even think about changing money at your hotel. The rates at most hotels are outrageous, and the city has plenty of banks and bureaux de change (exchange counters) offering better rates; most are open during business hours (weekdays and Saturday mornings). Rennies Bank's Waterfront branch is open until 9 pm daily. At the airport, Foreign Exchange exchanges currency weekdays 7 am-11 pm and weekends 8 am-11 pm.