If you are on a guided African safari, your chances of encountering problems are minimal.
Tour operators make it their business to know the areas they travel in, thus reducing risk to travellers. However, taking normal precautions on your African safari is sensible, particularly when travelling through urban areas.
Stay informed about the local news when travelling independently on your African safari. Ask your hotel about any unsafe areas and codes of dress and behaviour. 
Don’t openly carry valuables. If you must carry your passport and money, keep them in a buttoned-down pocket.
Always have a photocopy of your passport and any visas. Also, have a list of traveller’s cheque numbers. These copies should be packed separately from the originals.
It is never a good idea to carry large amounts of cash, and most urban centres (hotels, shops) do accept credit cards (Visa and Mastercard are most common) and traveller’s cheques.
You might need cash for purchases at local markets – keep this in a travel wallet or a zip pocket.
Never leave cameras and hand luggage unattended, whether in a vehicle or a hotel foyer.
Never pack valuables (this includes medication) in your check-in luggage.
Although Namibia is known to be home to several potentially dangerous species, especially snakes, scorpions, spiders, and insects, very few visitors are adversely affected.
Snakes tend to be shy and generally stay away from built-up areas.
Lodges and camps generally have insect (especially mosquito) proofing in their rooms. It is always a good idea to wear comfortable walking shoes, socks and long trousers.