MKA742 - the mention earlier of flying 50ft over elephant is really an absolute no go ! This kind of attitude is totally against any ethics promoted by the companies (Wilderness Safaries etc.) that you will be flying for and will get you into serious trouble if your pax report this to their Safari-Operator. I sincerely hope it was a bad joke on your side or you have a lot to learn. Grow up.
The Okavango Delta is one of the most spectacular wildlife areas in the whole world. The same goes for places in Namibia. Treat wildlife with respect and don't become a problem for the environment.