Forget what you think you know about Napa, because the soul of the valley has shifted south. Over the past few years, the heartbeat of the Napa Valley has shifted southward from places like St. Helena and Yountville to the slopes and foothills north of the town of Napa-a city that not all that long ago was something visitors ignored on the way to tonier spots to the north. But new vineyards in the area, new restaurants, and slightly more affordable housing has shifted the axis of energy in the Napa Valley. If you want to feel the new pulse of Napa, this is where you want to be.