When the weather's fine, few experiences rate more sublime ("pure magic," enthused one recent guest) than sitting on Truett Hurst's sandy, tree-shaded Dry Creek shoreline, sipping a Green Valley Pinot Noir or a Zinfandel Rosé, chatting with friends, and watching the water flow by. In addition to the Rosé, Truett Hurst makes six Zinfandels, a few of which are always poured in the contemporary,...