Because of the heat, Egyptians tend to live a nocturnal life. Save your energy by relaxing during the day and checking out the lively nightlife.
You can haggle everywhere. So, never take the first price on anything. Offer your price, walk away and you'll be sure to come out with a steal!
When I visit Egypt, I have to make sure that baby wipes and Antibacterial products are always around. Especially when you are visiting in the summer, you need to stay refreshed. (I won't even mention sunscreen).