On the furthermost tip of Massachusetts’ Cape Cod lies the seaside town of Provincetown, a progressive enclave which for decades has hosted artists, beach bums and pleasure-seekers, arriving en masse when the weather turns and remaining until summer’s end. It gives P-Town – as it is affectionately known to residents and returning visitors alike – a uniquely spirited character. But, away from the bustle of downtown Provincetown there are more sedate pleasures to be found – not least in the long stretch of undulating Atlantic coastline, one of America’s most peaceful.