Yay! That was fun!

Now fetch it. 

Head up the stairs behind the cannon (or take the slope to the right of the stairs).

Follow the path around to the left and continue along it. Take the first branch you come to on your left. 

Follow it to the south, and again, take the first branch you come to on your left. That will lead you to the sea wall path. 

Find the imaginary cannonball.

Look! It’s over there to the east by the tree within a circle of stone.

The tree speaks to you…