A modular and reconfigurable activity system comprising: a modular activity board (2100, 2300, 2500, 2700, 2900) formed of a deck having a top surface, a bottom surface, a first end portion and a second end portion, characterized in that the modular activity board further has opposing side rails (2115a, 2115b), each of the first and second end portions being angled upward from the top surface of the deck, the deck being defined by a longitudinal axis through the first end portion and the second end portion, and a latitudinal axis through an approximate center of the deck through the opposing side rails, the deck further having a first activity accessory receiver proximate the first end portion and a second activity accessory receiver proximate the second end portion, each of the first and second activity accessory receivers being defined by a single circular aperture and having a first locking mechanism therewith; and further characterized in that the activity system further comprises a set of activity accessories, each activity accessory (2120, 2304, 2502, 2704, 2706, 2902) of the set of activity accessories comprising an attachment platform (2121, 2306, 2508, 2712, 2714, 2906) that is sized and configured to mate within the single circular aperture, the attachment platform further having a second locking mechanism (206, 3100) therewith to cooperate with the first locking mechanism to releasably secure the attachment platform within the single circular aperture, each activity accessory further comprising an activity mechanism extending from a top and/or bottom of the attachment platform to enable an activity to be performed by a rider of the modular activity board when the activity accessory is secured to the deck. a modular activity board (2100, 2300, 2500, 2700, 2900) formed of a deck having a top surface, a bottom surface, a first end portion and a second end portion, characterized in that the modular activity board further has opposing side rails (2115a, 2115b), each of the first and second end portions being angled upward from the top surface of the deck, the deck being defined by a longitudinal axis through the first end portion and the second end portion, and a latitudinal axis through an approximate center of the deck through the opposing side rails, the deck further having a first activity accessory receiver proximate the first end portion and a second activity accessory receiver proximate the second end portion, each of the first and second activity accessory receivers being defined by a single circular aperture and having a first locking mechanism therewith; and further characterized in that the activity system further comprises a set of activity accessories, each activity accessory (2120, 2304, 2502, 2704, 2706, 2902) of the set of activity accessories comprising an attachment platform (2121, 2306, 2508, 2712, 2714, 2906) that is sized and configured to mate within the single circular aperture, the attachment platform further having a second locking mechanism (206, 3100) therewith to cooperate with the first locking mechanism to releasably secure the attachment platform within the single circular aperture, each activity accessory further comprising an activity mechanism extending from a top and/or bottom of the attachment platform to enable an activity to be performed by a rider of the modular activity board when the activity accessory is secured to the deck.