What should I avoid in Cusco?

Cusco sits at 3,399 meters above sea level, higher than any ski resort in the Alps. The air carries roughly 40% less oxygen than at the coast, and your body needs 24 to 48 hours to start adjusting. The mistake most first-timers make is landing at Alejandro Velasco Astete airport, booking a 6am PeruRail departure to Machu Picchu the next morning, or heading straight to Saqsaywaman by 2pm. By evening they're in bed with a splitting headache and nausea. Do nothing ambitious on your first day. Walk slowly. Drink coca tea at your hotel. Eat light. The thin, cold air on an August morning makes even a walk up Calle Suecia feel like a stairmaster. Pressure behind your eyes, shortness of breath on a single flight of stairs. Normal at this elevation. It passes. Diamox (acetazolamide) is available without prescription at Cusco pharmacies for around 15 soles, under $5 at the current exchange rate of roughly 3.38 soles to the dollar. Start it a day before you arrive if you can.

Calle Plateros and Calle Procuradores, which locals call Gringo Alley, are lined with travel agencies selling Machu Picchu packages, Sacred Valley tours, and Rainbow Mountain day trips. At least a third are unlicensed resellers who book you onto someone else's bus and vanish when things go wrong. The tell is a Sacred Valley full-day below 150 soles or a Machu Picchu day trip under $50. At those prices, expect a 4am departure, a guide reading from a script in halting English, and no entrance ticket included. Book through your hotel's concierge or a licensed operator with a DIRCETUR registration number posted on the wall. The baby-alpaca photo hustle works the same circuit around the main plaza every day. A woman in traditional dress holds a lamb or baby alpaca, you snap a photo, and suddenly you owe 10 to 20 soles. The animals are often sedated. If you want a llama photo, walk up to San Blas where they wander the streets on their own.

The restaurants on three sides of the Plaza de Armas share two things. A second-floor balcony with a view of the Cathedral (built from 1559), and prices 3 to 4 times what you'd pay two blocks away. A lomo saltado on the plaza runs about 45 soles. Walk 5 minutes to Calle Nueva Alta and the same dish at a menu restaurant costs 12 to 15 soles, with soup included. The menu del dia, a set lunch of soup, main course, and drink for 8 to 15 soles, is how locals eat. The kitchen is cooking for regulars, not tourists passing through once. Skip ceviche in Cusco entirely. You're in the Andes, a 10-hour drive from the coast. The fish is frozen. Lima does it properly. Eat what the city does well. Rocoto relleno, a hot pepper stuffed with ground beef, still sizzling from the clay oven. Cuy tastes like dark-meat rabbit with crispy, lacquered skin. Not a gimmick. A staple since pre-Inca times.

Cusco's solo-traveler safety scores 6.2 out of 10 (see /research/solo-safety/), which means manageable but not carefree. The poorly lit blocks between the main plaza and San Pedro Market are where most phone snatchings happen after 10pm. Take a taxi after dark. A ride anywhere in the centro costs 5 to 8 soles. Don't walk the path up to the Cristo Blanco statue or toward Saqsaywaman after sunset. Muggings along that hillside trail get reported monthly. San Blas, the neighborhood uphill from the plaza, is the safest area for evening walking. Its narrow cobblestone lanes stay populated with restaurant and bar traffic until midnight. Worth noting, the so-called free walking tours offered by guides in red vests near the Cathedral run about 3 hours, end at a travel agency, and the final 45 minutes is a hard sales pitch for a package tour. The guide works on commission, not tips.

August is peak dry season. Cold mornings, strong midday sun, and bone-dry air that cracks your lips within 48 hours. Temperatures currently drop to around 5°C before sunrise, with near-total cloud cover and 99% humidity at dawn. By noon, direct sun pushes the feeling closer to 20°C. The UV index at this elevation regularly hits 11 to 14, rated extreme by WHO standards. You will burn in 15 minutes without sunscreen, even under clouds. Bring SPF 50 and lip balm with UV protection. The wet season runs November through March, with heavy afternoon downpours that turn cobblestone streets into ankle-deep streams within minutes. The Inca Trail closes entirely during February for maintenance. For fewer crowds and fair weather, April to May and September to October tend to offer the best balance.