Warning: Spoiler! (Click to show)
Those are handsome.
The Platinum AMEX does not charge a currency conversion fee. This is a recent benefit as AMEX used to charge about 5% on top of the daily exchange rate. Hence, I used my Mastercard when abroad which only charged a 3% currency conversion. The Platinum and I assume Black AMEX only charge the daily or average exchange rate (something like that but the point being there's no surcharge or fees hidden in the exchange rate that I can tell).
I also recommend checking the market rate prior to using PayPal, credit card, etc. And while we're on the topic, these currency conversion fees are chump change compared to what the money changers at the airport and tourist areas charge. I've seen exchange rates listed at as much as a 16% premium to the market rate and they charge a flat fee service charge on top of that. Avoid money changers whenever possible. Compared to this, a 3% conversion fee on your credit card isn't bad. You can also order foreign currency from your bank for a modest charge, but you have to do it in advance. I've also had good luck using foreign ATM machines. The cash is deducted from my US account, and the bank charges me about 3% for the conversion.
Best of luck.