Make sure you check out the Birqash Camel Market. It's about an hour ride in a taxi from downtown Cairo. There's a small admission fee, but once you're in you can take pictures and wander around all you want. There are camels everywhere and all of the men are there to buy and sell them. There are impromptu auctions which are very interesting. Try not to get trampled!

Cairo is an amazing city packed full of everything from markets, to monuments, museums, interesting neighborhoods. Oh, and of course the pyramids. Definitely allow yourself more time in Cairo than you think necessary. It's a wonderful city to spend some time and get to know. There are such diverse neighborhoods that you'll easily be entertained no matter how much time you have. Also, head to the pyramids as early as you possibly can. The cruise ships dock in Alexandria and then make the drive to the pyramids in time to arrive in the late morning or early afternoon. If you beat these crowds, your experience will be so much more enjoyable. If you're early enough you may even miss most of the touts. And of course, the lighting when the sun is low makes for the best photographs.