The watercraft is designed to be used by poor swimmers and to be propelled by a double paddle in a leisurely way. The hull forms lateral stabilizing floatation bulges and a central fully-open cockpit providing a high back-rest and a seat followed by an inverted V-shape portion for supporting the boater's lower limbs in a semi-flexed condition. The forward part of the V-shape portion is provided with a central upwardly-extending rib, also protruding from the forward wall of the cockpit to provide a separation extending between the legs and feet, the feet being laterally confined at the foot-rest by the rib and the side walls of the cockpit. There is further provided a triangular flap member pivoted to the top of the cockpit at its back to form a steeper back-rest when pivoted within the cockpit and a more-inclined back-rest extension when pivoted over the deck.