We're young seniors and spent a week pre cruise visit to Peru.
We had prescribed altitude sickness pills and drank gallons of their cocoa tea, and still, though in excellent health, huffed and puffed all around Cusco and Machu Picchu.
But it was well WORTH every single huff and puff. We were there in January two years ago and much to our surprise was hot and sunny the day we spent at Machu Picchu even though there had been snowy sleet in the early morning in Cusco.
We were not part of a luxury ship tour which tend to be more sedate.
We boarded the Celebrity in Chile and from there sailed around the Horn.