its too late us...
The benches are actually these ones, closer to the shore, across the grass field - he looks in the direction of the shore here. But I think the marked tree is the correct one, the view on page 10 in the down-left panel also matches.I think you are right. The little wall, the benches and that tree fit pretty well. Also if you follow the path with the benches you get to the bridge with the bridge post you can see on page 10.