Oak Bluffs wakes early in summer, and the first sound is often a mower somewhere past Ocean Park, where the green runs wide and open all the way out to the bandstand. A&M Lawn Care works that kind of grass — the salt-fed, sea-air kind that grows fast in June and needs a steady hand to stay even. Mowing, trimming and edging, plus the seasonal cleanups that bookend the island year, done so a yard looks cared for on an ordinary Tuesday and not just before company comes. There is a plain satisfaction in the last pass, when the lines finally agree with each other and the walkway shows a true edge. Around the harbor and out along the roads that leave town, that is the work.