In North America, it's pretty easy to get by without carrying much cash around. For the most part I pay for all my smaller purchases with debit these days. If I have a larger purchase to make, I generally use my credit card to accumulate some points. But outside of North America and Europe, it's been my experience that cash is generally still king. And while having a credit card is great for emergencies (such as being able to get a hotel or a flight in a pinch), I generally make a run to an ATM machine once a week and pull out enough cash to get me by. Local currency is best for obvious reasons, ...