Planning your trip three months in advance is highly recommended because it allows ample time to make all necessary arrangements, such as booking accommodations, transportation, and tours, ensuring availability and better rates. Additionally, early planning helps you acclimate to the altitude gradually, which is crucial for high-altitude destinations like Cusco and Machu Picchu, reducing the risk of altitude sickness and enhancing your overall experience. It also provides ample time to prepare travel documents, pack appropriately, and organize any additional activities or excursions you wish to include in your adventure.