Luxor, a 10 hour train ride South of Cairo and two hours North of Aswan- better than Luxor and not to be missed. We missed it. Not enough time, but based on our experiences in Luxor I definitely plan to come back and make it to Aswan, and again to Luxor, hopefully more time in both locations. A four day cruise on a multi-level "hotel ferry" costs about 300USD and takes four days from Luxor to Aswan. Three Hundred of these boats used to operate on regular runs linking the two cities in a consistent flow of tourists. Now, based on recent political developments, the decrease in tourism has turned Luxor into more of a ghost town when compared with the droves of tourists you read about. We were told that only about ten of these cruise ferries are operating now and they're not even running that much. All that being said, the ruins are unchanged by today's politics and the sites are well worth visiting.
These photos are both from Karnac, as well of some in the slide show below which also includes a view of Luxor Temple and shots of the Nile.