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Victoria Falls is a park you can enter. You can just visit the park, you don’t have to pay for any specific activity or tour - you can enter and walk around yourself.
I entered the park on the Zambian side. The Zambja side entrance fee is cheaper than Zimbabwe. In Zambia it is 20 USD and in Zimbabwe it is 100 USD to enter for 1 foreign person.
I only entered the Zambian side park and the border bridge. The Zambian side is beautiful and definitely worth the trip. There are many pathways to take within the park. These pathways take you close to the falls itself.
You can bring your own food and drink into the park. There are bathroom facilities at the park. Park staff are very kind and will personally guide you to any place you need to be. You will buy tickets at the entrance and show them to park staff upon entrance. You will sign the book when you enter.
One certain nights a year, there is a Lunar Rainbow special event where the park remains open after 6pm. It is a separate ticket to purchase, and you can remain there until midnight. Do your research on the date and times, but it’s best to go during true day before, during, and after a full moon in June, July, and August.
Be prepared to get wet at the park, especially walking along Knife’s Edge Bridge as mist rains down.