2. Try to use your credit card that does not charge a currency conversion fee.
3. Make sure that you withdraw money from legit ATMs (there are many fake ATMs in touristy spots). Visa and MasterCard has list of verifiable ATMs.
4. Make your ATM security code at least 6 numbers. In many countries, ATMs don't work with 4 digit security codes.
5. Tell your credit card companies and banks countries you are going to visit. Otherwise they can block your credit and debit card.
6. Don't leave your money and credit cards in glove compartments of your rental cars (there are a lot of cases when credit cards are stolen from glove compartments).
7. Do not carry large bills. Here is one story: We found ourselves in Paris at 9 am with a 500 EURO bill (husband took it out of ATM machine earlier in Moscow) and could not buy anything or get change. We had to find an exchange place and ask them to break it. Another reason not to carry large bills is you are robbed you don't loose all the money. Leave the rest of the money in hotel's safe.
9. Bring with you the credit card with the smallest credit limit. In case it gets stolen, the damage will be minimal
10. Use an RFID wallet that has a metal mesh around it so that your credit card info cannot be read and stolen remotely. It works for passports too. See this wallet. http://www.amazon.com/Womens-Blocking-Leather-Wallet-Burgundy/dp/B004ZL0DPM/ref=sr_1_1?s=office-products&ie=UTF8&qid=1380642394&sr=1-1 I heard that people got robbed this way. These devices are very common now, especially internationally. You can even download an app for electronic pickpocketing and get credit card numbers using your cell phone, it's unbelievably scary. Most credit cards now come with electronic chips (take a look at yours), as well as passports and drivers licenses.