The remains of the turntable at Lakeurst may be covered, but there's other neat stuff to see there. A brick-lined well that I assume fed the water tower still exists just inside the tree line, between the mainline and the Barnegat Branch. If you walk south on the mainline and cross the trestle, the concrete supports of the old ashpit, used to clean out the steam engines, still stand.
Remains of another turntable can be found in Barnegat, along the old CNJ right of way. I believe the walls are intact, but it's filled in with soil, with only a portion of the walls showing. Another well is located nearby, allthough the adjacent landowner recently filled it with brush and debris. The old CNJ coal trestle (built and first used by the Tuckerton) is also a must-see if you are visiting Barnegat.
There are also remains of two more of the Tuckerton Railroad's coal trestles in Tuckerton. A bit of the old engine house foundation can still be found in the woods there, as well as the rotting pilings and wooden base of the freight house.
I assume some of you are familiar with these sites, but I'm a fairly new railfan, and still get excited exploring them.