Walk along the path next the forest until you reach this dirt road (to the left). Make a left onto the unmarked path.
Continue to follow the path to the left.
This is where we followed the path up to the right and then walked up to the ruins (on the hill). When you finish exploring, return to the green marked path.
After exploring the ruins, return to the green trail and follow it.
Follow the green trail until you reach the blue trail. Follow the blue trail to the left until you return to the trail head.