1] An option that we seized was to travel across the border from Zambia into Zimbabwe at Victoria Falls where you can have a lion encounter. This was one and a half hours of being with some wonderful cubs - I say cubs, two of them were sub-adults. Walk with them, touch them, massage their paws. A truly wonderful and humbling experience but it cost a lot to get across the border (cheaper to pay for two single entries into Zambia, by the way)
2] Seeing my first leopard - and there were five leopards in different sightings - the most elusive and shy of cats and we saw five! I'm not over it. I don't think I ever will be, happily. Plus, at different times, nine lions, not counting those in the encounter.
3] Taking a helicoptor ride over the Victoria Falls. Even though water levels were low (September) it was still awe insipring from the air. None of us had flown this way before either and the flight itself was exciting.
4] Seeing heavyside dolphins on the 'whale spotting cruise' from Walvis Bay, near Swakopmund, Namibia. This is an optional trip - take it. You see seals up close and personal, pelicans and other sea birds, plus a huge seal colony from the boat, the possibility of Southern right whales (not this time) and of course dolphins (rarely NOT spotted). Brilliant trip with a champagne and oyster lunch. Inexpensive too! 4] Watching wildlife by night in one of the three waterholes which are at the various campsites in Etosha NP. We saw so much and it was so close. The animals can't see you so you can relax and just watch the spectacle: elephants, giraffe, zebra, jackals, birds, kudu and other antelope, wildebeest and, if you're lucky and we were, rhino. Excellent for photos.
5] Chobe NP was absolutely amazing. We took a sunset cruise and lost count of the wildlife, much of it very close: crocodiles, water monitors, hippos (and out of the water too!), buffalo, elephants, baboons etc etc. This was included in the trip and well worth the trouble.