This is a trip that I was very "ify" about doing solo with all the political unrest, but after visiting I say If Egypt is on your bucket DO IT!!! I did not have any safety issues. Egypt's tourism industry was hit hard by the 2010 revolution & all of the bad press.
The question you must ask yourself is are you really safe anywhere? Americans are being killed in churches, schools & at country music concerts. So you are just as likely to die at home as you are in Egypt. As with anywhere else in the world you have to keep your wits about you. There are some great people in Egypt but there are also some apples that spoil the bunch.
The worst part of the visit was all the hard hustling of people trying to make money doing felucca boat rides or trying to show you around. I booked the Cairo portion of my Egypt visit as a layover because of the mixed reviews I got, but on my layover leaving Egypt I stayed in town at a hotel attached to the Cairo City Stars mall and nobody cared that I existed. I was able to walk through the mall without anybody bothering me.
The main attraction in Cairo is the Giza pyramids! I can’t even explain that experience. My cell phone camera died a day before I got to Cairo so I missed a lot of pictures being bummed about my phone. I still had my regular camera, so I really had no excuse for missing shots. I rushed thru Giza because I was trying to make sure I had time to get through all of my tour before the time I needed to return to the airport. Next time I will only plan Giza and just take my time walking around. I was also able to visit the Egyptian Museum & the Cairo Tower on my layover leaving Egypt.