Late on a July evening the courts and cul-de-sacs off Hamlin go gold, sprinklers ticking, the smell of cut grass still hanging over the pavement an hour after the mower has gone. Dan's Lawn Care works those neighborhoods on a route you could set a watch by. Mowing, trimming, edging and the seasonal cleanups make up the whole of it, done the plain way and done again next week. In this part of Rochester Hills the lots are deep and the back yards run to trees, so nothing is rushed at the corners. A yard that simply looks cared for is not a small ambition — it is the entire one.