To BikerZ, Hi. Yes, we were on the Silverado Trail. We started in Napa and turned around in Calistoga. The traffic with wine enthusiasts can be heavy at times but only as you enter Calistoga and those extra wide, extra smooth bike lanes make it feel safe no matter what. We loved riding around St. Helena too for a change of pace to the Silverado Trail which begs us to go fast.
Funny how 50 miles+ can seem longer on the relative flats without the hills where you change position. Be sure and vary your position or stand at times just to move the body. I recommend this ride now before winter sets in as the colors are as perfect as I've ever seen...and those wonderful smells of the grapes fermenting on the vines is fantastic.
Enjoy!