Sad as it is to see summer’s berries and melons recede from Greenmarket stands, fall brings its own distinct pleasures. First among them are New York State grapes, in abundance from now until mid-November. Indigenous varieties like Concords, Niagaras, and Himrods prove there’s life beyond Thompson Seedless. And don’t miss Buzzard Crest’s white and red grape juice, available Saturdays at Union Square.