A convertible inflatable stand-up paddle board includes a main body member defining a first aperture and optionally a second aperture, and one or more panels fixed to the main body member and covering a bottom end of the apertures. A foldable seat assembly is disposed in the first aperture, and a second seat assembly is disposed in the second aperture. The seat assemblies have a seat portion and a backrest portion. The backrest portion is movable between (i) a folded position wherein a surface of the backrest portion and an upper surface of the main body member define a standing surface for the stand-up paddle board, and (ii) an upright position wherein the backrest portion extends away from the seat portion. The stand-up paddle board is thereby convertible between a stand-up configuration and a sit-down configuration.

This invention relates a removable seat for watercraft 10 of the type having a hull or underside 13 and a deck 14, and wherein the deck is connected to the hull by side portions or rails 15, and said deck includes retaining means in the form of one or more recesses 20 formed in or attached to the deck. The seat includes a seat base 112 and a backrest 111, and anchoring means 130 connected to structural means supporting said backrest, said anchoring means extending generally away from a lower portion of said backrest and a rear portion of said seat base, and wherein said anchoring means is locatable within a respective one of the retaining means 20. The seat is retained in an operative attitude by first releasable securing means connected to an upper part of said backrest and connectable to a location on the deck or the rails generally forward of the seat, and second releasable securing means connected to an upper portion of said backrest and connectable to a location on the deck or the rails generally rearward of said seat.

A bicycle and board apparatus comprising a buoyant board, a front wheel, a rear wheel and a steering member, and being mountable and usable in a first configuration as a bicycle in which the buoyant board is the bicycle's frame and in a second configuration as a surfboard by changing the orientation of the front wheel, the rear wheel or the steering member with respect to the buoyant board.

A wheeled system for engagement with a surfboard is provided. Wheeled mounting plates removably engageable with a bottom surface of a surfboard, allow a rider to ride on support surfaces such as the sidewalk, and to remove the wheeled mounting plates to employ the surfboard in the water. The wheeled mounting plates may be retrofitted to existing boards with an elastic or mechanical engagement, or provided in combination with a surfboard.

A portable floating board device for various water activities such as swimming, diving, fishing, and emergency use. The floating board device includes a secure platform to sit or stand. The board includes an anchor system and storage system. The board may be carried by handles or by straps attached to the bottom side of the board for easy portable.

A convertible inflatable stand-up paddle board includes a main body member defining a first aperture and optionally a second aperture, and one or more panels fixed to the main body member and covering a bottom end of the apertures. A foldable seat assembly is disposed in the first aperture, and a second seat assembly is disposed in the second aperture. The seat assemblies have a seat portion and a backrest portion. The backrest portion is movable between (i) a folded position wherein a surface of the backrest portion and an upper surface of the main body member define a standing surface for the stand-up paddle board, and (ii) an upright position wherein the backrest portion extends away from the seat portion. The stand-up paddle board is thereby convertible between a stand-up configuration and a sit-down configuration.

A convertible inflatable stand-up paddle board includes a main body member defining a first aperture and optionally a second aperture, and one or more panels fixed to the main body member and covering a bottom end of the apertures. A foldable seat assembly is disposed in the first aperture, and a second seat assembly is disposed in the second aperture. The seat assemblies have a seat portion and a backrest portion. The backrest portion is movable between (i) a folded position wherein a surface of the backrest portion and an upper surface of the main body member define a standing surface for the stand-up paddle board, and (ii) an upright position wherein the backrest portion extends away from the seat portion. The stand-up paddle board is thereby convertible between a stand-up configuration and a sit-down configuration.

An attachment system for affixing a number of accessories to an aquatic board. The attachment system includes an attachment bar having a length to extend laterally across a portion of the standup paddleboard. The attachment system further includes a first board clamp attached to the attachment bar at a first end of the attachment bar, and a second board clamp attached to the attachment bar at a second end of the attachment bar. The first board clamp and the second board clamp each have an internal surface to complement and engage with a respective location of the standup paddleboard to attach the accessory attachment system to the portion of the standup paddleboard.

A modular bicycle and board apparatus having a buoyant board, a front wheel, a rear wheel and handlebars mountable and usable in a first configuration as a bicycle in which the buoyant board is the bicycle's frame and in a second configuration as a surfboard by changing the orientation of the front wheel and handlebars with 90 degrees with respect to the buoyant board, the surfboard being steerable from the handlebars.

A buoyant board has: a board body; a propulsion system connected to the board body and including a propulsion unit for providing thrust to the buoyant board; and a handlebar assembly pivotably connected to the board body, the handlebar assembly being pivotable between a lowered position and a raised position. The handlebar assembly includes: a central handle configured to be grasped by a rider of the buoyant board, the central handle defining a distal end portion of the handlebar assembly.