Peru: How many days which places
Lima (Peru) has some interesting districts (barranco) and things to do but I'd recommend cutting as much time out of lima and stacking it on to sacred valley (it's pretty big and has lots to see), Cusco, or even go down to...
Peru: Travel to Machu Picchu from Lima
I would recommend flying to Cusco from Lima (Peru) over bussing. From Cusco to MP you can take a bus to hydroelectrica where you can then walk to Aguas Calientes or take the train from Cusco (http://www.bobaroundtheworld.com/machu-picchu-on-a-budget/...