I am SO glad we signed up for this activity!!! There were only two of us and they didn't cancel. They found two guides to balance out the boat. First we hiked to swim under the falls. Seriously if you're clumsy or easily tired, think twice. The half day tour was perfect and we felt completely safe with the expertise of the guides (they explained their certification process and it's VERY thorough) and educated us on the river difficulty in various water levels. They provided water too which is really important in the dry heat. We flipped near the end, and I got some big drinks of the mighty Zambezi!!! It's the best WWR trip I've ever taken. Just be warned, you will pay for your fun with the exhausting trip back up. They will stop for you though so don't let your pride kill ya :) ENJOY!!!