massgis import has polygons with leisure=recreation_ground, and this is logically like landuse=recreation_ground. Apparently mapnik already has support for this, and the following makes such parks show up nicely: Index: resources/styles/default/polygons =================================================================== --- resources/styles/default/polygons (revision 1366) +++ resources/styles/default/polygons (working copy) @@ -39,6 +39,7 @@ leisure=park [0x17 resolution 20] leisure=pitch [0x19 resolution 20] leisure=playground [0x17 resolution 20] +leisure=recreation_ground [0x19 resolution 18] leisure=sports_center | leisure=sports_centre [0x19 resolution 20] leisure=stadium [0x19 resolution 19] leisure=track [0x19 resolution 18]