We took 150.00 in cash when we left home and came back with about 50.00 when we got home three months later. Always travel using only a Visa debit card and even added a "conversion" process to my data base file that tracks expenses. It wasn't perfect but it got us within a few bucks throughout the trip and would use either a standard setting on conversion rate or could be adjusted manually for any individual purchase. Found only one place in Eagle River Alberta that wouldn't take the debit card.
Good luck and enjoy the trip