An ‘-est’ is always a good starting point for any work of creativity, and nothing makes a road-trip more interesting than a chance turn off to see the largest, the biggest, the widest, the, um, hairiest. Or, in this particular case, the southerliest – or rather, the most southerly –point of England.
Just think if your character were on a journey to see the four corners of a country, or indeed, the world. What might make them set off on such a pilgrimage? Who might they meet or collect on the way? And what might the outcome be?