(3)   Parks and Open Space Use Category.
This category includes uses that may occur on land that has been identified for parks and recreation uses open to the public or to be left in a generally natural state. The parks and open space subcategories are:
(a)   Natural Resources Preservation.
Undeveloped land left in a natural state for specific use as visual open space or environmental purposes.
(b)   Passive Recreation.
Recreational facilities associated with pastimes that are incidental to natural open space. These facilities require minor land development, require minimal maintenance, and have little impact on natural open space.
(c)   Active Recreation.
Recreational facilities that require major land development, structure construction, and a moderate- to high-level of maintenance and can accommodate large groups of people.