Know Before You Go
Park at the coordinates 39.3352193,-74.9613468. Walk along the railroad tracks heading northwest. There may be train cars parked there, but it's okay to walk along the tracks.
Keep walking until you reach the sandy portion after the bridge. Once you reach that spot, there will be a trail opening to the right. That is the horseshoe trail that will take you to the chimney ruins and foundations, eventually leading you to the blue lake.
If you want to see the sawmill and gristmill ruins, do not take the horseshoe trail. Keep walking until you see a third trail opening (the second opening is the exit of the horseshoe trail). Walk along the trail, you may come across and abandoned dune buggy that has been there for a while. You'll then be walking on asphalt covered with sand. Walk along the trail and you will come up on the mills. But don't worry if you past the third worn trail, you can keep walking until you come across another opening. You may see an Osprey nest on the electrical pole.
Keep in mind that the sawmill and gristmill ruins are not that far from the train tracks.