On the Ground--Show Them the Jacksons (or International Equivalent)

Show Them the Jacksons (or International Equivalent)—People fuss a lot about travelers’ checks and credit cards when traveling.  In many places, travelers’ checks simply aren’t accepted or are accepted with great hassle.  Credit cards or ATM cards typically carry a fee for withdrawals.  Some banks and credit card companies offer an international travel card with no transaction charge.  Do research ahead of time about the prevalence of ATM's at the destination.  

Against conventional wisdom, I feel it is important to carry a healthy amount of cash—preferably in $20 denominations or international equivalent.  Cash is still king in most places, and currency still has considerable clout around the world.  I advise a mix of credit and cash.  You should have both a credit card and an ATM card.  

In countries that don’t accept your currency, I recommend exchanging money at a local bank if possible, followed by a local exchange shop with good exchange rates.  I have found the hotel and airport exchange shops to have the highest exchange rates, but the airport shops are safe and handy in a hurry.  Shop around for the best rates, but don’t let the search take time away from your vacation!

Use pickpocket-proof clothing and bags.  And don’t overlook the small safe now common in most hotel rooms.  Finally, while it may be cheaper or more fun to use the subway (such as Tokyo's elaborate subway system), a cab or Uber/Lyft may be safer.