re: Best Napa wineries?

Just went last week but brought our two minor daughters so focus was more on sightseeing and less on tasting. The ones we visited were Castello di Amorosa (got some great photos there), Sterling Vineyards (to ride the gondola and more photos), Domaine Chandon (across the road from where we stayed), Peju (nice art inside) Franciscan (beautiful grounds) Robert Sinskey on Silverado Trail near Yountville (they are remodeling now but nice Pinot tasting), Beringer Winery to see the Rhine House and tour the tunnels, Tractor tram tour at Benzinger Winery in Sonoma Valley near Glen Ellen (pretty Oakville Grade drive through the mountains to Glen Ellen).

Also, if you have time, drive to Bodega Bay on the Sonoma Coast, drive down to Marshall on Tomales Bay and eat BBQ oysters on the porch at Marshall Store or at Hog Island Oyster Co. Then drive to the lighthouse at Point Reyes National Seashore. Drive back through Petaluma and drink at Lagunitas. Fun day.

You're going to enjoy it.