Wearing khakis And hiking boots screams tourist. It makes you a target for criminals and that sweet camera you bought for your trip is going to find a new home. And besides, if your trip is going to involve hiking of any kind S&R would prefer you wore bright clothes so it makes your @$$ easier to find if you get lost.
If you are going on a game drive (no one here calls it a safari) keep your doors locked and windows rolled up. Otherwise, enjoy being Simbas lunch. Respect the wildlife, they are wild animals and have no qualms about making you unalive."