Between Cairo , Luxor you can take a flight or you could go on an overnight train so you don't really waste time you sleep on the train instead of a hotel. Flying is the quickest way of course. I've always chosen to fly between the two. I've never actually gone to Aswan but I believe there is a train there as well. You could do a Nile cruise only between Aswan and Luxor and that's the way to really see most of the interesting sites between the two locations but if your looking to not travel on any cruise at all even 1/2 day trips then the train is probably the best option. You could hire a driver as well but that would take longer and waste your time. If your only there for a short vacation don't wast valuable tourist time on cruises or trains unless necessary do flights when possible or travel at night on the train to combine sleeping and travel.