If it were my last safari, I'd have to include several things that are just fun to hunt. Lion and Leopard would have to be there along with elephant. To hunt lion and leopard, however, you'd have to hunt something that would be good for bait. So if we were limited to five animals, that would force you to hunt other things that would be great hunts themselves but would also be good to hang in trees. That would, of course be buff and hippo. You could get 6 lion baits from these two or even more for leopard.
So if we were capped at 5 animals, wanted a great last hurrah, needed bait, then my choices would be lion, leopard, ele, hippo, and buffalo.