We visited 4 wineries (Imagery, Benziger, Paradise Valley and Mayo)
Sufficient time spent at each 1 to sample the flights of wine, but not any spare time as 4 is quite and ask in a 1-day trip.
Tasty lunch of sandwiches and cookies from a local deli (they ask when you book if you've any dietary requirements)
Pretty good value for money with a pleasant, knowledgable guide