Napa Valley wine tasting tour.

I am planning a trip to San Francisco and I wanted to stop by Napa Valley, which is an hour away (is it worth the ride?), and so I was wondering what a tour is like and which tours would be best. I did a quick research, but they seem all so similar. Also how would it be like? Do we walk from one vineyard to... show more I am planning a trip to San Francisco and I wanted to stop by Napa Valley, which is an hour away (is it worth the ride?), and so I was wondering what a tour is like and which tours would be best.

I did a quick research, but they seem all so similar. Also how would it be like? Do we walk from one vineyard to another and try it like that or would we walk into a cellar and try it that way.

Help! I have so many questions!

I also heard about bike tours around the vineyards. Is that possible and if so how was it?
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