How do I style gmap specifics?

Question

I'm trying to a) coloring points for cities red b) coloring borders between countries yellow c) coloring the text for oceans purple Can you recommend any specifics? Here is my style variable

 var darkStyle = [

{
  featureType: "all",
  elementType: "labels",
  stylers: [
    { invert_lightness: true }
  ]

} ,

    {
    featureType: "water",
    elementType: "all",
    stylers: [
      { visibility: "on" },
      { saturation: 40 },
      { lightness: -92 }
      ]
    },
    {
      featureType: "landscape",
      elementType: "all",
      stylers: [
        { hue: "#6d8f39" },
        { saturation: 50 },
        { lightness: -45 },
       { gamma: 0.9 },

{
      featureType: "administrative.locality",
      elementType: "labels",
      stylers: [
        { hue: "#0022ff" },
        { saturation: 50 },
        { lightness: -10 },
        { gamma: 0.9 }
      ]
    }

      ]
    },  {
      featureType: "road",
      elementType: "geometry",
      stylers: [
        { hue: "#00ff00" },
        { saturation: 100 }
      ]
    },
    {
      featureType: "landscape",
      elementType: "geometry",
      stylers: [
        { hue: "#6d8f39" },
        { saturation: 75 },
        { lightness: -45}
      ]
    }

];