Marinwood CSD owns over 800 acres of open space, including much of the Miller Creek corridor and the ridges overlooking the community, and Blackstone Canyon. The proximity to open space contributes much to the character of the community. The open space affords many opportunities for hiking on its fire roads and trails.

The Park staff also maintains street landscaping, including the Miller Creek Road and Blackstone Drive center medians, the landscaped berms in Lucas Valley Estates, and the pedestrian lanes connecting many of Marinwood’s streets.