First - if you have ever ridden a bike, skied, or rode a horse, you can do this. I'm 73 and had a terrific, safe experience.
The wine trolley tours are fine, but this adds a dimension and learning experience to a tour of Sonoma and the vineyards that you will not be able to experience any other way. I did both and had far more fun and learned more about Sonoma history and origin of the vineyards than the "sitting" tour. It was a BLAST and our tour guide, Hunt, was an incredible resource for information.
Definitly an experience that will top your visit to Sonoma.