Don't fly from sea level to 3900m. It's silly. There's not enough oxygen.
We arrivesd at Juliaca airport and immediately noticed the thin air. The colour of the sky and the intensity of the sun was different, too. A peruvian pan pipe band was playing in the airport - so wonderful i bought their CD!
Edgar met us and drove us to Sillistani, an archaelogical ruin of funeral towers. It was really impressive, and Edgar was a great guide. He lived just down the road and his natve language was Quecha. We also bought some cloth from a lady who lokked about 110. And stopped at one of Edgar's friend's houses to see their guinea pigs (cuy) and see their way of life.
Their stock is well cared for - all tethered, bght in at night and seemingly well-cared for. If you have stock, you're considered rich.
When we got to Puno, i was suffering. It just got worse, to the point where i could barely function. We went out for a feed of guinea pig, but I didn't have an apetite. By the morning i knew i couldn't go on the Lake Titicaca excursion. I stayed in the hotel drinking coca tea.
So, 50 years of wanting to go there, and i only saw it from a distance.
I cried.
I also got better when we moved 400m lower to Cuzco.