hola amigos, 1. the best thing to do if u r going to the huayhuash is to pay the protecation money alone and not through the agency! our guide "lost" the money and its dangoures there if u dont pay. and another thing... its costs less if u pay alone. like 85-90 soles. most of the agencies takes for it more than 30 dolars! 2. be prepered for the cold! its really really cold! take a warm bags if u can and lots of clohts! and most important enjoy the trek. its sooooo beautiful!