text: Hi Harry, I actually think that's the 'most appropriate' tag currently. Maybe also a bit 'too appealing' since most county and municipal 'conservation areas' such as this one are called "Open Space" and "open space" is used in the tagging language http://wiki.openstreetmap.org/wiki/Tag:leisure%3Dpark - it may be best to discuss with the OSM-US Talk list that these should be migrated into http://wiki.openstreetmap.org/wiki/Tag:boundary%3Dprotected_area maybe protect class 6 or 7 