While visiting to Peru, guides is almost mandatory to visit the archaeological sites in Peru for everyone; when you hired one your trip will lot more informative and memorable. You get lots of knowledge about country. But if the trekkers is well experienced and have visited at different places of Peru many times then s/he may not need guide. But the guide can play big role to make your tour. They will provide information about the tour destination along with its surroundings. Similarly, if any problems will arise during the tour, then the guides will solve it easily and it will be rather difficult for the travellers themselves to solve them.