Don't let a trip of a lifetime to Machu Picchu be ruined by forgetting the right gear. I learned this the hard way when I packed at the last minute and left my rain jacket behind. Luckily, a friend saved the day with a spare-but you don't want to rely on chance. Packing smart doesn't mean overpacking. Whether you're arriving by train, bus, or on foot, a few key essentials can make all the difference. Think comfortable hiking boots, insect repellent, and a lightweight daypack.