At the southern end of the Sonoma and Napa Valleys lies the chilly but hospitable Carneros region, packed with rustic and historic wineries and boutique cellars alike. This weekend wineries open their doors for April in Carneros. In addition to a selection of new releases at discount prices, many wineries will be hosting live music, art shows and food pairings. April in Carneros uncorks April 18–19, 11am to 4pm. $45. www.carneroswineries.org.