SONOMA — It's 11 a.m. on a Monday morning, which seems like an excellent time to be sitting on a sun-splashed patio, gazing out at dappled green vineyards and surrounded by big bottles of tiny bubbles. But I didn't need to travel to the Champagne region of France for this trip. I'm in Sonoma County, just an hour or so north of San Francisco, and a region that's on the rise in the fizz firmament.