The big 5 was originally the name of the 5 hardest animals in Africa to hunt, thankfully now it is used by tourist with cameras rather than poachers with guns. The Big 5 consists of lion, Elephant, Buffalo, Leopard and Rhinoceros and one of the best places to see all 5 is Kruger National Park in South Africa near the border with Zimbabwe.
Attempting to spot these 5 as well as the other popular African animals like Giraffes, Hippos and Zebras makes for a great family vacation. The kids will love sleeping in huts or camping out under the stars with lions roaming around.
Expedia offer great flights to South Africa