This trail could be really nice, if it were more traveled and better maintained. The views from ocean bluffs are spectacular, and the lighthouse is picturesque... But the trail is not clearly marked. There are many confusing intersections, and the route description is misleading. We were lost and confused no less than 10 times, and as a result, the hike took nearly 4 hours. Parts of the trail go through tall, scratchy grass. And there are many many ticks out there- Watch out!
The first problem we ran into was at the beginning of the hike. After a short segment through the woods, we passed two huge gun batteries. These were not mentioned in the trail guide at all. We lost the trail here because it veered off into the woods to the right, although the main path continued straight to Camp Hero Road. I can't understand why this wasn't mentioned in the book.
Between this point and when we arrived at the ocean bluffs, there were several unmarked trail/road junctions. The trail guide says to pass through the marked gate to Camp Hero State Park, but if you do that, you end up back where you started. Instead you need to pass BY the gate.
Also, the guide led us to believe we could swim along the way. But realistically, you don't want to swim during the first half of your hike because they you'll be all wet and sandy. And by the time we got to Oyster Pond, we were too frustrated to bother.
I recommend the area (great views- great beaches), but you might be better off driving all the way to the lighthouse and exploring on foot, rather than trying to complete a circuit.