You can exchange money in your home country or in Peru, and it is best to take care of it before your trip officially begins so you do not have to worry about exchanging money as you immerse yourself in your experience. ATM machines, banks and currency convertors are normally located within major tourist locations, but not easily accessible in many remote areas and ancient sites. It is a good idea to always have some cash on you for meals, attractions or any unforeseen items, but it is not a good idea to carry large amounts of cash on you.
Major credit cards are widely accepted. You can use traveller’s checks in some places as well, however the exchange rate is quite high, so you may want to avoid these.
Be sure that your Peruvian bills are clean and free of any tears or damage as they may not be accepted by stores or vendors.