Machu Picchu - it is one of the most incredible things that you will ever see and I cannot recommend it enough
Centro Histórico - old town area of Lima with many amazing churches and historic buildings
Miraflores - modern but beautiful area of Lima
The official currency is the Sol, but I had no problem paying in USD or credit cards everywhere I went.
I used Uber throughout my time in Peru, in both Lima and Cusco. It worked well for me and was really inexpensive. I flew Avianca from Lima (LIM) to Cusco (CUZ). I took a PeruRail train to and from Cusco Poroy station to Machu Picchu. I also walked a lot in Center Historico.
I flew TAME from Quito (UIO) to Lima (LIM). I flew Amaszonas from Cusco (CUZ) to La Paz (LPB).
I had great food, including some amazing empanadas, throughout my time in Peru.
PLUGS / ADAPTERS
Peru uses standard U.S. plugs - no adaptor needed!
None for U.S. citizens.
I felt very safe the majority of my time in Peru. I had a small incident where I thought I heard gunshots at my hotel in Lima, but they turned out to be firecrackers. I felt safer certain parts of Lima, such as Miraflores, as well as during my time in Cusco and the entirety of my time visiting Machu Picchu.
SHOULD YOU VISIT?
Yes! I cannot stress enough how incredible a visit to Machu Picchu. It is just stunning. Lima was not my favorite city by any means, but it is definitely worth a day trip. If you visit I would recommend spending more time exploring the country outside of Lima. Cusco was great and Machu Picchu is the best. It is one of the coolest things I have ever seen!