The best travel card for the USA has excellent exchange rates (Wise Multi Currency), does not charge for international transactions (HSBC Global Everyday), does not charge for cash withdrawals at ATMs (Citibank Global Everyday) and you are able to use it within Australia as well.
We suggest taking at least one credit card, like the BankWest Platinum Breeze and the ING One Low Rate credit card which both have very low interest rates and no ‘international transaction fees’.