Victoria Falls on the Zambezi river on the border between Zimbabwe and Zambia. One of the wonders of the world. I have seen them as I lived in Africa for 25 years. The locals call it "Mosi-oa-Tunya" meaning "The smoke that thunders" because of the tremendous noise that the falls create as well as the constant mist and can be heard from dozens of miles away. The falls are 1.7 km wide and drop about 110 meters, making them the largest in the word. The only other comparison in terms of waterfalls would be the also spectacular Iguaรงu Falls (another great destination) in the border between Brazil and Argentina. Niagara falls are also lovely but smaller in comparison.
The Zimbabwe side of the falls is more spectacular. They have bungee jumping, white water rafting in the Zambezi river and game reserves nearby
Staying in Africa, move further south into South Africa and visit one of the world's most beautiful city; Cape Town. (I've also visited on 3 occasions) There are lots of fascinating things to do in and around Cape Town, like visiting the wine estates, the fantastic beaches, game reserves, whale watching, or for some really great adrenalin you can go feeding the great white sharks, followed by a relaxing drive along the Garden Route.
Next and still in South Africa go further north and visit the Kruger National Park (one of the best in the world for big game). If you still have money in you pocket head over to Sun City and blow it away in the casinos.
One very unusual Game park that is hardly known can be found in the country of Gabon. Its called the Loango National Park where you can find "hippos surfing" and where the elephants also like to stroll along the beach and the Lowland Guerillas are still very accessible because of their few contacts with human beings.
https://www.google.pt/search?hl=pt-....,cf.osb&fp=6287e541056464cc&biw=1024&bih=605
There are so many unusual and fascinating destinations. Even the Cape Verde Islands (on my signature) are a great year round warm and sunny destination.
Wish I had lots of money so that I could just go around to all these exotic and unusual places.