Apparatus and method for adapting stand up paddleboards to stable recreational platforms

A conversion kit for a stand up paddleboard (“SUP”) having a front end, a rear end, a right side, and a left side, and a plurality of tie-down elements, a middle portion and a rear quarter portion, the conversion kit comprising

• a storage container comprising
• a storage container bottom,
• a storage container top, such that the top is spaced apart from the bottom,
• an SUP attachment element configured to attach the storage container to the middle or rear quarter portion of a SUP, so that the storage container functions as a seat;
• a right side pontoon assembly comprising
• a right pontoon, and
• a right side frame having
• a lateral frame element affixed to the storage container,
• a pontoon fame segment attachable to the right pontoon, and
• a diagonal frame segment between the lateral frame element and the pontoon fame segment, such diagonal frame segment is angled rearward of the storage container,
• such that the right pontoon is positioned rearward of the storage container when the storage container is attached to the SUP;
• and
• a left side pontoon assembly comprising
• a left pontoon, and
• a left side frame having
• a lateral frame element affixed to the storage container,
• a pontoon fame segment attachable to the left pontoon, and
• a distal portion attachable to the left pontoon, and
• a diagonal frame segment between the lateral frame element and the pontoon fame segment, such diagonal frame segment is angled rearward of the storage container,
• such that the left pontoon is positioned rearward of the storage container when the storage container is attached to the SUP.