Driving SCL to Nevados de Chillan (August)

We are planning an August ski visit to Nevado de Chillan. We fly into SCL Santiago at about 7am where we have rented a 4 x4 and plan to drive the same day to the mountain (5-6 hours I think). I am just wondering if anyone can recommend some stops along the way. I wouldn't mind stopping at a winery for lunch, but it is winter season after all, so I'm not really sure if anything would be open (for ambiance and food - not wine, as I know the laws are strict). A picturesque town would be nice as well. I welcome and appreciate your comments and suggestions. Thank you.