My friend who lives in Lima recommended:
“First go to Huaraz, may get some rain but not too much and then go to Arequipa, Cuzco, Puno… and at the end of your trip to Iquitos.
They could go to huaraz to acclimatize and look around, but they should go to cordillera huayahuash, you can choose 4 days, 8 day, 10 days for trekking there… they can get information in huaraz… they can contact our guide in huaraz
And if they have time, they can go mancora beach, and manglares de tumbes, even they can across the border peru-ecuador, and they can continue to Guayaquil, Quito”
If you do go trekking in Huaraz let me know – I’ve used several good guides over the last 5 years or so, including most recently this June…. Dave