What do I need to know for making this a day trip? Do I need to purchase winery tickets to just enjoy the sights and a couple glasses?

Tickets are for the tour

If you want to do the tour or a tasting, purchase tickets in advance to save money. If you only want one or two glasses of wine you can purchase on site.

Purchase your tickets online, and I did the tour and taste package. You only need to bring yourself.

Only for the tour.