It's been 10 years since I've been to Napa, so I'm very out of the loop. We are staying in Yountville, Calistoga, & Healdsburg. What are the "must do" wine tours/tastings? I want to do the main ones but am also looking for family owned small quaint wineries as well. And if so, do you need reservations or appointments at these? I don't want to spend the entire trip with booked appointments, but if there are worth it I would take suggestions. Also about how many wineries can one visit in a day if your just into dropping in, looking around on your own, and tasting? THANK YOU!!!