Visitors from the United States, Canada, the United Kingdom, Australia, and New Zealand require only a valid passport and return ticket to be issued a 90-day visa at their point of entry into Peru.
Make two photocopies of the data page of your passport, one for someone at home and another for you, carried separately from your passport. While sightseeing in Peru, it's best to carry the copy of your passport and leave the original hidden in your hotel room or in your hotel's safe. If you lose your passport, call the nearest embassy or consulate and the local police. Also, never, ever, leave one city in Peru to go to another city (even for just an overnight or two) without carrying your passport with you.