I drive past this place for years and I was pretty sure it was here that they took the picture. It is now a vineyard and does not look the same. It is along Highway 121 between Sonoma and Napa. If  you google map this address 3032 Fremont Dr, Sonoma, CA, United States you can see it today by going to street view. the photo for street view is a foggy fall day but it is the same Bliss photo hill. It looks incredible when the leaves change color in the fall, but right now it does not look too special. Hope this helps.