Open space shall be optimally related to the overall plan and design of the development and improved to best suit the purpose(s) for which it is intended. No less than 15%, less existing and proposed road rights-of-way, shall be devoted to open space and/or recreation facility purposes. Individual residential lots or portions thereof shall not be construed as open space. Stormwater detention basins may be included in the open space calculation. Such designated open space shall be in parcels interspersed among grouping of residential dwellings, where appropriate, and, where possible, shall be interconnected with open space areas on abutting parcels. Also, such open space areas shall be provided with adequate street access and may include land developed for specific purposes (e.g., stormwater detention). Active and passive recreational facilities shall be provided in an age-restricted village residential development for the use and enjoyment of the residents of the development and their guests, which may consist of the following: an in-ground neighborhood swimming pool provided with an improved sitting area, contiguous to all sides of the pool; a clubhouse with meeting rooms; multipurpose space; fully equipped game rooms; art and craft rooms; fully equipped kitchen; office space and service facilities; bocci, shuffleboard and horseshoe courts; regulation doubles tennis courts; exercise areas and stations; picnic facilities; outdoor sitting areas; gardening areas with a communal greenhouse; and a system of handicapped-accessible sidewalks and pathways. Recreational facilities within the multifamily building may include a library, workout room, multimedia room and billiard room. The location of such recreational facilities shall be carefully planned to provide privacy for the users and to avoid problems of noise, spillover lighting and similar nuisances on nearby residential units. All recreational facilities shall be subordinated to the residential character of the development and be appropriate to a planned age-restricted village residential development. Open space shall be suitably landscaped. All structures within open space areas shall be sited so that the open space retains its visual appeal. The Planning Board shall require active and/or passive recreational facilities and such grading, drainage, planting, sidewalks, pathways, fencing, lighting and such other improvements in open space as may be necessary to enhance the intended open space and recreational uses.