A mixture of ways of accessing money is always best, so if one of them fails you have other options. The best thing about ATMs is you get local currency at a good exchange rate (although bank fees can be a bit steep - check with your bank).
Consider opening a new account with a new card and keep a low balance and a low daily withdrawal limit, so if you are skimmed or robbed they don't get your life's savings.
Here are some other money security tips
Phil at the safety hub about 7 years ago
all of the abuve a quait right.
the best wey is to mae big withdrolls once in a while throw atm's...
best to use a visa card ( all over saoth america) bicuse the exchainges there will suffer less exchainge diductions then any ather card...
it's alweys good to keep like 500$ american dollars cash as a last risort hidden in your
stuff. everywere poeple will accept them and you will get griet raits for exchaingeing american cash. (but thay shuld be last risort your goal is to finish the trip without useing them).
truvelers checks are a good idea but not for south america.. it is very very hars to find places that accept them. so you will have to cash out a very big amunt every time you get that chance. and bay doing so you acompish nothing in trying to protect your mony. over 6 years ago