I've seen a few snakes in KNP.
Black mamba that was a few inches short of being the width of an S-road in length. Phenomenal. (Satara area.)
Ranger walking out of 'old' Lower Sabie (before the new shop / restaurant / deck arrangement) with a snake on a stick, as we were driving in. Predomonantly grey, lean, and fairly long, and there was no doubt in our minds what it was (mamba). However the ranger told us it was a Cape wolf snake. Harmless. Doesn't even have teeth IIRC. But flippin' scary to look at! :eek:
Mfezi just south of LS. Had just left camp, and saw an unusual looking piece of 'branch', just off the road. Snake had crawled out of his hidey hole, and had found a nice sunny patch to warm up. As we pulled up adjacent, he stood up and hooded, but settled down almost immediately. Didn't move off, so I guess he didn't feel particularly threatened. I lost the roll of film the pic was on.

Kept the windows up - take no chances!
But overall, snake sighting is exception rather than the norm, particularly in camp. I make a point of scraping / scuffing my feet on the ground when walking after dark... snakes feel the vibrations and tend to move off.
Must say, I'm not fond of snakes at all. On December holidays, our last night at Trennery's on the Wild Coast, I put my foot down next to a grass / bush snake of sorts. Around 60cm in length, and feisty. Saw it out the corner of my eye. Yelled 'Snake!' and the SO jumped two feet! That was me finished. SO picked up a rock, but I asked her to please not kill it. That's when I twigged as long as I could see the snake, and know what it was doing, I was okay with it. In the end my boet did the Steve Irwin and popped it into a jug, for release down at the bowling green.
Nothing in comparison with our digs in Durban... something like 14 snakes on the property in our three years there. Worst was a night adder. Scariest for length and sheer ugliness was the molesnake on the steps.