I am an American who lived in カイロ for twenty-seven years. The city is friendly and people will go out of their way to help foreigners. There are hustlers who will try to push their wares on you at the tourist sites. As far as safety goes, it is much safer than a large American city. You will have a great time! Please try to learn a few words in Arabic, it really helps!
For the best pizza in Luxor, head to Quick Pizza. All pizzas are freshly baked in front of you and so are wonderfully fresh. For dessert, leave room for fateer -- Egyptian pancake which you can have with fruit, mixed nuts or -- delicious -- honey and cream.
Luxor is like so totally awesome! #1 tourist destination.
I have just returned from カイロ alone and am a young woman. I had no problems -- it's a lovely place. Just dress conservative. Yes, you are stared at and hassled a bit, but just say you're married and your husband is working and always say you're busy and goodbye. This worked for me. Garden City is a safe and quiet area for ladies alone. Go for it -- I did and it won't be my last time.