Noel Wigdor is a 21-year-old Canadian doing South America right.
On his travel blog he posted a trip report of a rainy, problematic adventure on the Santa Cruz Trek out of Huaraz, Peru:
This is by far the most popular serious hike in the region and is indeed, as Noel tells, one of the best hikes in the world.
Noel at the top of the pass â€” Punta Union 4760m (15,617ft).
If you are packing for a trip to the Andes check out besthike.com Santa Cruz for details. It’s 50km (31+ miles) plus sidetrips, 4 days recommended. Best months are May to September. Altitude is a factor.