Late August light comes off Sengekontacket Pond in flat sheets, and every lawn along that stretch takes on the same soft gold for an hour. Cool Island Scape Inc. keeps those yards in order through the long green months — mowing, edging, string trimming into the corners, and spring and fall cleanups when the oak leaves and pine needles let go all at once. Salt wind and sandy ground make Oak Bluffs grass its own particular puzzle, and the answer is regular attention rather than one grand effort. A property cut on schedule simply looks different from one that is not: settled, quiet, ready for whoever pulls in. Week after week, that is what the crew is after.