Being a blonde female will attract you a lot of attention in Egypt even from male hotel staff. So be careful and make sure you travel with a companion, a male companion/friend would be even better. Have your companion with you even if you are relaxing on the beach or beside a pool in your bikini.
The attention you receive will be safe but annoying. With no disrespect to Egyptian men, they believe that if they harass 1000 female tourists for their "affections" and only 1 female responds then their harassment works and they will keep trying. It’s basically a population thing male vs female ratio and also religious beliefs that there is no sex before marriage and their women cover up. They see all western women as easy, even if you are not easy. So seeing a blonde woman in a bikini would be an ultimate pleasure for a male Egyptian.
I had Egyptian male wait staff flirt heavily with my wife, and totally ignore me, at breakfast inside the Cairo Sheridan.
Have fun but I would cover up if you were not at a busy beach or hotel/resort pool.