It seems to be a distinctly New Yorker thing. More precisely, a Manhattanite. We live on an island, and eventually it gets into many of our heads to walk the perimeter of the island. Maybe it’s like the trout swimming upstream; it seems instinctive. It’s such a commonly held impulse that, back in 1985, conservationist Cy Adler started the spring tradition of The Great Saunter, an annual stroll by the island’s natives around their slender urban rock.