It is feast and vacations usually conjure up images of relaxing with a cocktail by the beach, under the lovely sun.
But if you live in Cairo you will prefer to stay in it during Eid, because you can enjoy the empty streets and there are lots of things to do to enjoy this vacation.
The best place to really observe the beauty of a nearly-empty Cairo is the Cairo Tower and some hotels in Zamalek.
You can also pay a visit to the pyramids and enjoy the ideal time to take those typically tourist photos of the Pyramids. Then right before sunset, rent a felucca, and relax while looking at the sunset view on the Nile.
In the end I wish you a good vacation wherever you are right now.