If you are acclimating to Peruvian culture, the Miraflores suburb of Lima is a good home base. When it comes to organized tours Cusco, Lima, and other urban areas are often best initially explored in a group. This is known as a safe district, though it is highly recommendable to take the following safety precautions:
While Peru uses its own monetary unit, the ‘Nuevo Sol,’ it is wise for travelers to carry some US dollars just in case. If you bring US dollars, it is best to bring medium- to high-denomination cash bank notes. If dollar bills are marked or damaged, they might not be accepted in Peru.
It is best to carry an ATM card, as ‘hole in the wall’ ATM machines are generally available in Peru’s cities and large towns, and widely available in Arequipa, Cusco, Huaraz, Lima, Puno, and the Lima Airport. Travelers’ Checks in US dollars can be changed in most cities and large towns, though there may be a commission fee.
Major credit cards from international providers are often accepted in shops and restaurants, though you may be charged a fee.
Never change currency with cambistas, or street money exchangers. It is best to use a casa de cambio, or exchange bureau, or a bank when changing money. Ask the agent to provide you with billetes chicos, or small notes, like 10 or 20 sol notes. It can be difficult to get change for larger bills once outside of Lima. Before you turn over any US currency, count your soles carefully, also checking for forged notes.