I visited Egypt back in 2001. I did a cruise on the Nile based around Luxor. There are plenty of different temples around the Luxor area as well as the Valley of the Kings, so we lived on the cruiser & travelled each night. Luxor is several hundred miles south of Cairo. I was only there for a week & did not get a chance to see the Pyramids. I was a little disappointed with this, but there was loads to see around Luxor.
I did an extra plane trip to see Abu Simbel which was pretty special.
If you've not had a good look at a map, Egypt is virtually all desert with a small habitable area each side of the Nile. Cairo is near the Nile delta & Luxor is several hundred miles South (about 500 IIRC). Sharm is away on the East coast, so nowhere near either Cairo or Luxor.
Egypt was hotter than I could have imagined. The temperature was over 50c every day and even at night was still above 30c. That was inland, so it may well be cooler on the coast.
The culture is very different too. Egyptians tip (baksheesh) for everything. Even if you ask directions, you should expect to pay for it. They are even very keen to sell you things while you are standing in a queue & are so pushy about it that it may get on your nerves. The best way to stop this is to politely say 'no' in their language (Leh).
Things are different on the road too: drivers do not turn their lights on at night because it runs the battery down:tumbleweed:, they only observe a red light if a police car is visible close by, passengers ride the bumpers of vans & best of all, if you are on a single-carriageway (dusty) road & want to overtake, you sit there beeping your horn at the car in your way!
After a week there, I really felt like I had been away somewhere very, very different. Surely that is what a holiday is all about?