East River Road at seven in the morning: water on one side, deep lawn on the other, a heron standing in the shallows like it holds the deed. Cookson Lawn Care mows along there and back through the island's inner streets, cutting even and trimming close around old posts, hedges and stone. Grass this near the channel stays lush into September and asks for a steady weekly hand. Cleanups in spring and again in late fall clear the cottonwood and oak leaf off the turf. The reward is a lawn that looks composed from the road and from the water both.