text: "It is a park according to County Parks (and me, as I park my car here sometimes) as it meets the leisure=park definition of "area of open space for recreational use" and contains amenities (parking)"
  
  Sounds like a public parking lot with some grass to me. Especially since it's fenced off (insinuating they don't want people to use it, or they just expect people to jump the fence? I guess there could be gate, but the gate could also be locked for public access if there is one..So...). 
  
  "I have heard that this will be used in the future to expand parking facilities and perhaps provide restrooms in the future, that is only being discussed at present."
  
  Sounds like it could be mapped as a park when that happens if it does then. Although plenty of public parking places have restrooms, those things don't make them parks. In the mean time I think it would be better mapped as a meadow (government owned meadows don't get auto park tags either btw).  Since that's what it is, but I'll also check the SCCGIS thing when I have some time. 
  
  It could be part of a larger park area as you say also, but its really not clear that's the case since its surrounded by other landuse and I'm pretty sure the Nisene Marks State Park boundary is mapped to far down. For me it looks like it's parking for the cycling center and pump track. Maybe the public can park there, as they probably don't care, and walk to the parks near by, but that doesn't make it parking "for the parks." It's probably the cycling centers property also. 