Places to visit: Drink coca leaf tea in Cajamarca. Cuzco, Trujillo and Chiclayo. If you stay in Lima, I'd recommend Mira Flores district. If you go to Machu Picchu, make sure you wake up early enough to catch the bus from Aguas Calientes to the top or you'll get there much later than you intend. Eat the cuy. Eat the ceviche. Lima smells like pollution and fish so limit your time there.