Islas Ballestas
Spectacular rocks pummeled by waves and wind into ballestas (arched bows) along the cliffs are what characterize this haven of jagged outcrops and rugged beaches, which serve as home to thousands of marine birds and sea lions. You're not allowed to walk onshore, but you wouldn't want to—the land is calf-deep in guano. Bring a hat, as tourists are moving targets for multitudes of guano-dropping seabirds. Also, be prepared for the smell—between the sea lions and the birds, the odor can be overpowering. A boat provides the best views of the abundant wildlife: sea lions laze on the rocks, surrounded by Humboldt penguins, pelicans, seals, boobies, cormorants, and even condors, which make celebrity appearances for the appreciative crowds in February and March. On route to the islands is Punta Pejerrey, the northernmost point of the isthmus and the best spot for viewing the enormous, cactus-shape Candelabra carved in the cliffs. It's variously said to be a religious symbol from the Chavín culture, a Masonic emblem left by the liberator José de San Martín, or a staff of the Inca creator-god Viracocha.