I visited the Napa Valley Museum to see the "Napa Valley Collects" exhibition. The exhibits include pieces from artists including Marc Chagall, Odilion Redon, Alphonse Muncha, Pablo Picasso, Cy Twombly, Peter Voulkos. It was small but impressive, well worth a visit if in Napa.
After the museum trip, we went across to the Domaine Chandon Winery next door for champagne and a late lunch. The sun was quite intense and the air conditioned restaurant was very welcome. The kids got rather rowdy at one point, so electronic gaming devices were sought out of the car to keep the peace.