The only permitted use in the Parkland Overlay District are limited to conservation of the area as a passive parkland or nature preserve, observing or studying the indigenous flora or fauna, hiking or fishing. Minimal accessory uses such as parking areas, restrooms or seating that support the primary uses described above are also permitted upon receiving site plan approval from the Planning Board and an affirmative finding that the accessory use supports the primary use of the area as a passive parkland and nature preserve.