There are many alternative treks to Machu Picchu if Inca Trail is sold out. The most popular ones are Salkantay Trek, Lares Trek, Huchuy Qosqo, and even the Short Inca Trail to Machu Picchu. Each of these treks has its own unique features and scenery. The Salkantay Trek is a longer trek that takes 4-5 days to complete. It's less crowded than the Inca Trail and has stunning views of glaciers and mountains. The Lares Trek is the shortest and easiest. It's not as popular as the other 2 treks, but it's very scenic, with beautiful lakes and mountains.
The 4-Day Salkantay Trekking is the second most popular hike to Machu Picchu, listed among the 25 best hiking tours in the world by National Geographic Adventure Travel Magazine. Over these epic 4 days and 3 nights, you will cross high Andean mountains, stunning lakes, and lush cloud forests to reach the World Wonder of Machu Picchu. Enjoy this exciting experience with comfortable tents, a Pachamanca barbecue, and a coffee tour, and return aboard a scenic panoramic train.