Plan 3–4 days in Cusco: one day to acclimatize and explore the city, one day for Machu Picchu, and one or two days for Sacred Valley and surrounding archaeological sites.
At 11,150 feet, altitude sickness affects many visitors; prevent it by arriving early, hydrating constantly, avoiding alcohol, and considering coca tea or medication prescribed by a doctor.
Cusco is generally safe for tourists in main areas; avoid walking alone late at night, don't display expensive items, and use registered taxis or hotel recommendations for transport.
May to September offers dry weather, clear skies, and perfect hiking conditions; December to March brings rain but fewer crowds and lower prices.
Cancellations, lost luggage, medical emergencies — travel insurance covers the unexpected for under US$2/day.
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