We were picked up from the Royal Livingstone Hotel by a vehicle sent by United Air Charter for a short 15 minute drive to the Helipad. Quick check in and saftey briefing, and we were escorted to the awaiting Eurocopter.
We were lucky that we got the two front seats, from where the views were incredible. The nice thing about the Eurocopter was the bubble windows that gave panoramic views.
15 minute flight, with the pilot explaining the Falls, and we had 2 clockwise, and two anti-clockwise circuits of the Falls. Was breathtakingly beautiful.
Soon we were down, and then offered to buy a Video of our experience for US$40 (too expensive after having spent around US$170 pp).
Would suggest you make this your first activity, so you have a better perspective of the area when you are doing ground based activities.