Cash is king, dollars are better than euros; watch for counterfeits. ATMs and credit cards accepted in cities and many towns.
Restaurants Service is not usually included in the bill; leave 10% to 15%.
Tours Guides are grateful for tips (10% to 20% is the norm); remember that their wage is often much lower than the tour price.
Taxis Tipping is not expected, though it's common to round up.