River boats are a special bread. Some boats like the Peapod will server you well on both calm and running waters, where others like Prospector and the McKinzie are best left to the moving waters. River boats are designed to be able to turn quickly and pivot in the water with little effort in order to avoide the rock in the middle of the river Because of the way they are designed, may of them will not serve you well on calm flat waters as they will not track nearly as well as a boat desing for that purpose. In general, river boats are mostly steered, not rowed or paddled as it is the power of the moving water that keeps them moving foward.
Although the Pea Pod is the notable exception, it is best kept to relatively slow moving waters. or flat waters.