the only reason I said guns or any weapons plus gold and silver is because they're must. I agree cash or documents don't really matter in that scenario since there could be nothing left but simply assuming you are the only one tarzan could be proven fatal. Since there will be no law, you could be killed or harmed, so we need weapons. We also need it to protect from any other wild life forms if there are. And say you rendevous with some other tarzans may be the gold and silver could start something for you. I wouldn't dare to exchange cash or if someone would dare I would slap that person right on the spot, but If presumably I would see the gold or silver, I might change my mind :D 
This precious metal is what has been causing people to do something since ages.