We are traveling to Peru in February to meet our daughter-in-law's family, they live in Arequipa. We are wondering about the weather? We will spend most of our time in Arequipa, but will be going to Nazca Lines, Culca Canyon, Puno,floating islands, Cusco,Aquas Calientas (hot springs), & Machu Picchu. I'll be there almost a month and want to pack light. Any advise on essentials to pack in Feb & what is needed for that long of trip? Also, I am a transplant recipient of abt one year, have gotten the MD clearance to go & will take extra medication. Other than drinking bottled water & not eating from street vendors, any health advice?