Ancient Egypt is a fascinating subject for children, who love to learn about the Sphinx, the pyramids, the tombs, and mummification (and all the gory details of how it was done!). In the UK it is on the national curriculum. In my experience parents are often surprised by how much their children know. I can recommend sites where children can relax and enjoy the sites and not be overwhelmed by the crowds.
I suggest the following books to read before you come.
Want to learn a bit of Arabic, try here Arabic Animal Names