Interesting; when I was in northern Tanzania I saw multiple leopards while on safari. They were always sleeping in a lone tree on the savanna. 30 Jeeps would all crowd on the road to watch one cat; I'm not sure how any leopards in the parks manage to rest.
Leopards aren't easy in most parts of Africa with the Serengeti being the best place to see them. There are so few trees and so many tourists that just looking for a large congregation of cars will usually yield one... It took me years to finally see one, while supposedly visiting parks where it should be possible such as Ruaha, Etosha and Nakuru. My only sighting outside Serengeti is in Samburu in N Kenya...