What? A traffic problem in St Helena? No, never!
The truth? I try not to go anywhere up valley (especially St. Helena) on the weekends and use Silverado Trail instead of Hwy 29 when possible.
Of course, an October ride through the valley on your favorite beemer is not to be missed. The grape leaves in their full Fall color is not to be missed.
Riding from Calistoga over to Santa Rosa should be nice too.