This is an awesome organic winery in the Maipu region of Mendoza. We rented bikes from Maipu Bikes and pedaled (partially along a very busy road) to a smaller road with 3 wineries -- Vina El Cerno was our 2nd stop. The winery offers several different tasting options - reds, whites and sparkling. This winery does accept credit cards and does not require a reservation. I went with a reserve red tasting -- that was really 3 full glasses of wine. While we were enjoying our wine, some grapes were brought up and being put through a mashing machine (I have no idea what it's actually called). That was a lot of fun to watch. Overall, decent wine and laid-back atmosphere. read more