Some of the great features of Bournemouth are the chines, little dry valleys that run down to the shore through the cliffs. These are densely wooded and the trees on the valley floor grow straight up to enormous heights in an effort to get to the light. The best walk, to my mind, is down through Alum Chine from Westbourne to the sea.
It's very difficult to get the scale of thes mighty trees but take my word for it. They are big.
Further down, the Chine opens out and little side valleys run off giving the impression of being in a dense woodland.