Ngorongoro crater will offer you a dazzling sight: gazelles, zebras, rhinos, lions, and if you're "lucky" you might even see cheetahs and leopards.
Mikumi is in Tanzania and here you can see quite an unusual phenomenon: the "midget" elephants.
A large conservation area in northern Tanzania, most famous for the wildebeest migration.
They are not the largest in the world, but they are truly amazing and highly publicized, being a major attraction in Africa.