What the hell do I do with a pocket full of pesos?
Nothing....
Try to pay for goods and services using BTC while you are there.
You will be treated as a king, probably get some good deals, and the Argentinians will get some REAL value for their work/goods.
Even if they do not know what BTC is all about, they'll probably prefer anything to their devalued worthless pesos.
Good Luck!