Greg's description matches mine. Used for recreation, not conservation, usually just grass, maybe a few trees scattered, sometimes there could be a playground there, maybe benches, maybe bbqs, ie. http://wiki.openstreetmap.org/wiki/Tag:leisure=park.
National Parks, Marine Parks etc would be boundary=protected_area. Looking at your proposal Steve, I can see the gap you're trying to fill, an area with a single name but might have areas of natural=wood and leisure=park all forming the same grounds. I think Central Park, NYC is probably the best example because it's likely to be understood more globally, as far as I know it's a mix of forest areas, recreation areas, but still the whole area is known as Central Park.
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