What are the requirements for a Mexican citizen to travel to Peru?

A US-Passport, and if you just planning to stay below 90 days you should be fine. But after that period of time you might need to leave Peru, or apply for a visa. If your planning to work or reside you might need to have an special job qualifications, if not you might be deported and the Peruvian officers might take you to the border with Chile, or Ecuador and leave you there till you get all your documents in order. You have a wonderful time there.