We were going from Napa to Sonoma so we took this route. We did not do it as an attraction but simply the road from point a to be. It takes about 30 minutes to get across. It is not like driving through the mountains in Colorado but it is certainly one step down. You don't get that high and there are few hairpin turns but it is a fun drive. It is a pretty drive, especially if you never drove in hills/mountains. There is a vineyard in the middle. We did see a few bikers and admired them for their effort. You better be in great shape and experienced to bike across.
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