Safety is always paramount when dealing with money, and it's particularly so if you're in a foreign country where you're unfamiliar with your surroundings. One of the best and easiest ways to keep your credit cards and cash safe while traveling is with a money belt worn under your clothing. Keep only the card and small amount of cash you think you'll use during an outing, stowing the rest of it safely in your money belt. For women, a cross-body purse that closes securely is a good way to thwart pickpockets. Men should switch to a front-pocket wallet or money clip.
Withdraw cash in large increments rather than just what you need for a single day or purchase. Since there are fees associated with every transaction, fewer transactions means fewer fees. Be alert when using an ATM, especially at night, and always cover the keypad when inputting your PIN. Trust your instincts: If you don't feel safe at a bank machine, find a different one.
When using your credit or debit cards abroad, make sure the transaction is in the local currency. Some merchants and bank machines will offer to make the conversion to dollars for you. It seems like a kindness, but the exchange rate for this kindness is usually abysmal. Plus, your bank may still charge you a foreign transaction fee, so the whole thing costs more than it would if you simply left the transaction in the local currency.