If you're going to Hurgharda, chances are you're staying in a big AI hotel with lots to do and you don't need to leave, unless on an organised tour.
I really wouldn't worry, Cairo is hours away. Security at the airport and in the hotels is very tight. I went a few months ago on a diving holiday and we were collected from the airport and taken straight to the boat, which we were on for a week, diving in the red sea.
On the last day there was a few hours between getting off the boat and the flight home so they put us in a hotel for the day. To get into the hotel all our luggage went through an X-ray machine and we had to go through a metal detector arch. There was also quite a lot of security around the hotels.
When we went back to the airport, we had to pass through several check points on the outskirts of the airport and to get into the building, where there were many more security checks and X-ray machines than European airports.
Think back - yes there has been a few attacks on Hurgarda hotels over the years, but security has increased massively since then, and in that time thousands, if not millions of people have had a safe holiday there. The chances of something happening to you is so small, it's really not worth worrying about.