Generar un polígono con puntos, aleatoriamente.

gmaps_random_polygon.js

map = new GMaps({
        div: '#map',
        lat: -12.043333,
        lng: -77.028333,
        tilesloaded: function(){
          var path = [];
          var bounds = map.map.getBounds();
          var ne = bounds.getNorthEast();
          var sw = bounds.getSouthWest();
          for(var i=1;i<=4;i++){
            lat = Math.random()*(ne.lat()-sw.lat())+sw.lat();
            lng = Math.random()*(sw.lng()-ne.lng())+ne.lng();
            map.addMarker({
              lat: lat,
              lng: lng,
              title: 'Marker #'+i
            });
            path.push(new google.maps.LatLng(lat, lng));
          }
          map.drawPolygon({
            paths: path,
            strokeColor: '#333',
            strokeOpacity: 0.6,
            strokeWeight: 3,
            fillColor: '#333',
            fillOpacity: 0.3
          });
        }
      });