We do exactly what others have suggested. As soon as we arrive at the foreign airport, we find an ATM and get some cash. Check with your bank ahead of time and find out which international banks they have agreements with because if you use those, then there's usually no fee.
Also, make sure your money is in your checking account and not your savings account because their ATM's do not give you the option to take money out of your savings accounts like ours do.
But you'll find ATM's everywhere you go, so you won't have a problem with that. Just make sure you let your bank know ahead of time what countries you'll be visiting. Same thing holds true for your credit cards, which we'll use alot for all of our big meals, hotels, etc.