We didn't know what to expect from this activity, but we were more than pleasantly surprised. Santino was a terrific guide: super-knowledgeable and full of energy. The ride itself was gorgeous. We rode by one vineyard after another in beautiful January sunshine. We learned a lot about wine-making, the region more generally, and the history of the Napa valley. The bikes are great for people of a variety of fitness levels -- one of us is an experienced cyclist and the other much less so -- and the different settings on the bikes in terms of how much assist you get were set up so that each of us could adjust to fit our capabilities. We went in the off-season so our group was Santino, the two of us, and Hiro, the photographer/videographer. I'd imagine the experience is less intimate in, say, September, when they can have up to 15 people in a group, but I assume that Santino's personality and energy would make your experience fantastic no matter the size of the group. We spent three days in Sonoma/Napa, and this was a highlight!