In Egypt, the exchange rate is fixed, so you will get the same rate wherever you exchange your money. Traveler's checks are accepted at most banks and bureaux de change-but a transaction charge is added to each check, so use large denominations of travelers checks when exchanging currency. Major credit cards are accepted nearly everywhere in Cairo. Therefore, it is no surprise that Cairo was recently ranked as the second safest city in the world after Tokyo. Pick pocketing is occasional, but tourists are rarely targets of crime.
Security is especially tight in all tourist areas, so there is nothing to fear.
Finally, as you will be walking quite often, beware of crossing the street in Cairo, since traffic is heavy. Regarding your health, it is very important to remain hydrated while in Egypt. When reaching for the nearest canteen, make sure that you are drinking bottled water. Tap water is not safe to drink in Egypt. The brands Baraka and Siwa are the most trusted.