All banks change foreign currencies, and most will change travellers cheques and offer cash advances on credit cards (both Visa and MasterCard). Virtually all now have reliable ATMs although some aren't accessible outside banking hours.
The following is just a guide, especially when it comes to tipping guides (be they guides in national parks or your driver), where it all comes down to how pleased you are with their services. To put things in perspective, the minimum wage (for those lucky enough to be employed) is Ar133,000 a month. A teacher would earn about Ar200,000 a month.
|Taxis, bars||Not expected|
|Porters||Small note (Ar200 or Ar500)|
|Restaurants||5% of the bill|
|National park/local guides||10% of the fee|
|Driver guide||Ar5000 to Ar20,000 a day|