Open space, particularly peripheral open space areas, containing existing attractive or unique natural features, such as streams, creeks, ponds, wetlands, woodlands, specimen trees, and other areas of mature vegetation worthy of preservation is encouraged to be preserved and in its natural state. Certain improvements such as the clearing of trails for walking, jogging, hiking and/or picnicking may be made in the open space. Recreation facilities may also include soccer, baseball, football, and other field sports that utilize open unlit fields.