See the "get in" section for details. A trip by boat along the Congo is one of the world's greatest wild adventures. Trips by pirogue for a few hours or a few days can be arranged in most cities along the river. Only a couple of tour operators in the country offer these rides, but if you speak good enough French or Swahili, you can probably talk a pirogue owner into a short trip (make sure you understand what you're doing & where you're going).
On the edge of Kisangani, these are the last cataracts on the Congo until Kinshasa/Brazzaville. Fishermen set up conical traps for fish and can be seen tending to these traps. Fortunately, the fishermen have realized that tourists want to see them and reportedly will charge a large fee to see them (USD20!) and/or photographing them.