Well I'm planning about 4 days in Cairo to see all the sites and take it nice and easy...
I got a day tour to the PYRAMIDS, SPHINX, MEMPHIS AND SAKKARA already booked.
What would be the best route to do? Is there a express train or flight to get to the other sites (2/3/4) my geography is a tad rusty of Egypt and/or a good tour company to recommend?

I think from there I'll fly to HRG to get some diving and maybe a few days in Taba Heights. I have to ask a diving friend who used to work in the area where it is worth while to go diving.