You can get from YVR to Lima for 17.5K each way per person using AA miles that time of year - if you go or come back after September 7, it's actually only 15K miles each way (on AA metal).
http://www.aa.com/i18n/disclaimers/f...ward-chart.jsp
If you actually want to go beyond Lima (like to Cuzco), you can book an AA partner award utilizing a combination of AA and LAN flights. Lan has an extensive network in Peru, as well as a number of flights from North America to Lima.
http://www.aa.com/i18n/disclaimers/a...rtnerChart.jsp
Buena suerte!