I went on the trolley with two friends, and we had a fantastic time! Jay, our driver, was knowledgeable, humorous, and fun. The other guests on the trolley were cool to be around and everyone had a great time. I especially enjoyed the winery tour at Benziger Winery, it was the perfect balance of science/wine information without being boring or too drawn out.
As someone who worries too much, I feel it important to point out that you're not going to get wasted on this trolley. We Ubered both ways from Hayward, CA to make sure, but the serving sizes, lunch, and 6-hour long trip meant nobody was over-served.