Hi Ben,
Your best bet is to diversify. I had some cash with me stuffed in different places in my backpack and a credit card (VISA). Having some cash with you (US dollars) is especially of use when you cross borders and want to exchange for local currency on the streets. Travelers cheques offer an excellent alternative option to have money on the road. You'll have no problems cashing them in South America.
Have fun! Keep us posted!
Best wishes,
Mark
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