Track makes a great loop walk from Ferry landing, suggest walking it in a clockwise direction. Back Bay may not be passable at high tide, or at least require wading.
It is steep in a few parts and will be slippery if wet, most of the steep bits are taken care of with steps, and there is plenty of them.
Allow about 1 hour for the round trip.
Those accessing the cache by car there is room for 1 or 2 cars at the trailhead