You may not have time to see everything in Cairo , So at least see the Highlight which is the Pyramids of Giza , as the great Pyramid is considered as one of the world wonders it is a shame not to see it. . .
This tour includes visiting the three Pyramids (Cheops , Chephren and Mycarenes) , the valley temple of Chephren , and of course the great Sphinx
there you can have a Camel or a Horse ride which give you a uniqe experience.
Also you can have lunch in one of the famous restaurant over looking the pyramids. . . Iam sure you will not pay much attention to the food as you will look at the Pyramids all the time. . .
In the evening you can book a Dinner cruise or Sound and light show