What are the best places in China where travelers can get the most favorable currency exchange rates for USD, EUR, and other foreign currencies when converting to Chinese Yuan (CNY/RMB)? Which options such as major banks, ATMs, airport counters, and licensed exchange offices provide the best balance of exchange rate value, safety, and convenience across major cities like Beijing, Shanghai, and Guangzhou? How do Bank of China branches, industrial banks, and ATM withdrawals compare with airport exchange counters and hotels in terms of fees and exchange margins? Which locations are considered the most reliable and cost-effective for getting the best currency exchange rates in China for travelers and business visitors?