I've hiked more than 2,000 miles in the last ten years, and all of them have been using two pairs of socks: a thinner, lighter pair (thin nylon dress socks) that take all the abrasion and wear and tear that would normally happen to my feet, and a nice thick pair of hiking socks.

My wife resisted this strategy for years, but is now firmly convinced.

Where are you going in Peru? We've backpacked there a couple of times---stunning scenery, lovely people, fabulous food, and incomparable archeology. We'd go back in a heartbeat.