A valid passport is required for all international travel, and it must be so for 6 months after the date you enter Peru. Depending on the country of your citizenship, you may be required to get a visa to come to Peru. (Citizens of the U.S., Canada, and the European Union do not need a visa). Check with your tour operator for details, or simply look online on the website of the Peruvian Ministry of Foreign Affairs or the same in your country of citizenship.
By Peruvian law, you must always carry the passport in case of random document checks in towns, hotels or other areas. It is also advisable to make some photocopies of your passport and store them in different bags, for it is the main ID for traveling in our country. See our article about visa, passport requirements for Peru.
If you are on any medication, or have any health issues, be sure to bring a copy of your most up to date medical records as well.
It is highly recommended that you purchase travel insurance. Wherever you buy travel insurance, make sure the minimum coverage includes: trip cancellation and interruption, baggage delay, baggage and travel documents lost or stolen, medical expenses, emergency assistance.
Also, do not forget to have the copy of your insurance policy easily accessible during the entire trip.