In all parks, there shall be one or more recreation areas which shall be easily accessible to all park residents. The size of such recreation areas shall be based upon a minimum of 250 square feet for each lot. No outdoor recreation area shall contain less than 2,500 square feet. Required recreation areas shall be computed in addition to any other common open space required elsewhere in this chapter. Recreation areas shall be so located as to be free of traffic hazards and should be easily accessible.