For my points, I'd take more Ventana and less Napa. But that's definitely just me. I like wine, but I don't drink a ton of it in any one sitting, and I'm not at all interested in going wine tasting anymore. There is some stuff to do outside of visiting wineries, but so much of what's going on there really revolves around that, that I got a little sick of it after a day there. Restaurants cater to the wine crowd, as do many of the stores in St. Helena, many of the organizers of activities, etc.