Warning from Australian government re strikes on May 27-28:
This Advice was last issued on Saturday, 23 May 2015. On 27 and 28 May, strikes and demonstrations against the proposed Tia Maria copper mining project are expected in various regions of Peru including Arequipa, Cusco (note that according to travel.gc.ca/destinations/peru the city of Cuzco and Machu Picchu are not affected), Ica, Piura and Puno. These demonstrations may turn violent, and protestors have in the past blocked major roads and restricted transport movement. We recommend you keep in close contact with your travel arranger and monitor local media for developments. The level of this advice has not changed. We continue to advise Australians to exercise a high degree of caution in Peru.
http://www.smartraveller.gov.au/zw-cgi/view/Advice/Peru