coastal Cornish cornwall England english exercise flora flowers footpath Great Britain green meadow natural nature path rock rocky spring trail walk wild architecture Armeria coast drystone landscape old rural stone thrift traditional view wall calm cloud coastline harbour Ives lighthouse ocean peaceful placid ripples saint sea shore sky St. Ives water boulder durable enduring fern granite granitic hard Michael mount national trust St. Michael's Mount beach cliff low tide sand sandy surf waves algae seaweed black brooding dark island rocks blue Molluscs mussels Mytilus seascape shellfish tide bushes clouds farmland fields gorse horizon meadows panorama plants shrubs trees villages bend countryside hedge lane narrow road route small transport twisting verge winding