Luxor is what is left of Thebes, the capital of Egypt for most of the New Kingdom, when the pharaohs ruled from here and were buried across the river. Karnak grew for about two thousand years. Luxor Temple stands on the corniche with a mosque built on top of its columns. On the west bank, the rock-cut tombs of the Valley of the Kings hold at least 65 tombs and chambers, and the temples of Hatshepsut and Ramesses III stand under the cliffs. A modern town of about 285,000 people lives in between.
It's a small town with an enormous amount in it, and a hard-sell one: calèche drivers, felucca captains and bazaar sellers start on you the moment you step out. Three days is the right length: one for the east bank, one for the main west bank sights, and a third for the quieter temples, the balloon and the museums. Less and you're racing the heat and the tour buses. More only makes sense with the tombs of the nobles or a day trip.
Day one is the east bank: Karnak, the Avenue of Sphinxes and Luxor Temple at night. Day two is the Valley of the Kings, Hatshepsut's temple and Medinet Habu. Day three is a dawn balloon, the Ramesseum, the workers' village and the Valley of the Queens, ending in the two museums. Luxor is the middle of an Egypt trip: most people arrive from Cairo and carry on to Aswan. Every site opens daily, so start on any weekday. The sleeper train from Cairo arrives at 6:10 am, just as Karnak opens.