A Saturday in Pearl River sounds like sprinklers, a screen door, somebody's kid on a bike, and a mower two yards over. Happy Lawns is usually that mower. The work is lawn care in its plainest form — cut, trim, clear the clippings off the drive, and leave a yard ready for a folding table and a cooler by afternoon. Grass in this part of Rockland comes on fast in May and does not quit until the leaves start, so the week comes around quickly. It is a good feeling to leave a street looking like summer.