Morning: visit the Giza plateau, to see the pyramids of Cheops, Kephren and Mykerinos, and the sphinx.
Visiting the interior of the Great Pyramid is optional. To be honest it's very disappointing, there's not much to see.
Meal at a local restaurant
Afternoon: Visit the site of Saqqara, the step pyramid and the site of Dashour to admire the red pyramid and the rhomboidal pyramid.