I was lucky enough to have a guide for several days in Cairo. Then I met my mother and brother and we completed the rest of the Egyptian expedition together. Egypt is full of remarkable sites but it is not one of the easier places to travel. You should be careful of what you eat as almost everyone I have talked to about Egyptian trips has been sick during there stay (including me). I have traveled extensively and Egypt has so far been the only place I have been very sick.
The pyramids were remarkable even with the high expectations I held for them. The Cairo Museum is full of incredible works. Cairo was enjoyable to walk around and visiting the large number of islamic and other historical locations is worth, at least, a couple days.