Replying to Trip To Aussie...Best way to transfer funds?

I'm going to Australia for a few weeks, and I'm wondering what the best way to transfer my money would be. I have a Chase bank account, a Chase (Visa) credit card, an Amex card, and a Mastercard. Will I be slapped with international fees if I use any of those credit cards over in Australia? Or am I able to buy a pre-paid debit card where I can just load a bunch of money onto before hand, and bring that with me?