A riding board such as a surfboard extending from a tip or front end longitudinally to a tail or rear end. The rear end terminates at a board interface plate that is incorporated into and as part of the riding board. The board interface plate is adapted to be either the tail section of the riding board or alternatively, a coupling means for connecting a tail block to the rear end of the board. The board interface plate includes a plurality of spaced apart coupling cavities that extend inwardly into the riding board body from the rear end. The surfboard may also be used with an interchangeable tail block having a tail faceplate that interfaces and couples with the interface plate on the surfboard. The tail block may be configured to most any desired tail configuration, size and shape.