There's something I really like about these mid-century parks.  They are heavy on the concrete and feel very urban.  Makes me want to break out the Vision Gator and skate like its 1979.  The 1960's parks don't as much seek to provide a green space, natural getaway as much as they intend to be a city park, a complement to their surroundings.  Heck, even the horseshoe pits are surrounded by concrete.