It can be difficult to know how much cash to bring when going abroad. Generally speaking, exchanging about $200 USD is a good idea, unless you know you are going on quite a few excursions where you will need to pay cash. There will be ATMs wherever you go and the exchange rate is usually good. You can always exchange any unused cash once you return. Remember, from Tip 85, exchange some small bills/coins so that you can use it right away when you land.