This really depends on your interests as there is far more to see and do in Peru than two weeks would allow at less than a dead run.
The ancient Incan capital of Cuzco and the lost city of Machu Picchu would be first on my list of to see. Lake Titicaca, the world's highest navigable lake is also in Peru if water destinations are your favorite.
There are a plethora of archeological sites and rain forests making up probably half the country.
There are adventure tour companies that offer bicycle tours, river tours, horseback tours, rafting, and just about any other kind of adventure tour you can think of should you prefer a guided travel situation.
There are also tours designed for photographers, gourmet tours to taste and learn to cook local dishes. If you have a passion, and add that to a search including the words tour and Peru I think you will find more ideas that match your personal passions for your trip to Peru.