One of the most enchanting country I ever visited. Try to stay overnight at Abu Simbel, the sunrise is magical, as the lights shine thru the entrance to Ramses Temple, feel you are in an Indiana Jones or Lara Croft movie. Amazing. Either on a Felucca or on a river boat, you must take either one. The Nile is just spectacular. Another of my fav site is Temple of Horus. This temple was discovered burried in the sand only 150 years ago. The colors of the wall painting inside is breathtaking. Didn't fade because of protection by the sand.
Cairo is a bit over rated, especially the Sphinx. The Cairo museum is ok, but I think they don't allow picture taking anymore. The bazzar is lots of fun.
I was still shooting file back then, and for a 10 days trip, Cairo, Luxor, Aswan, Abu Simbel and a 4 night cruise, shot over 100 rolls. If I go again, I will make sure I bring an 80 gig portable HDD.