We spent an afternoon at Milan Vineyards, only about a 30 minute drive up the PCH from where we live.
Just outside the quaint little town of Topanga Canyon, full of little shops and markets, lies (what I think is) a mansion surrounded by rows of grapevines. We participated in a tasting out on the patio of about 7 delicious wines. Also had some hors d'oeuvres of cheese, crackers, and chocolate.
A fantastic way to spend a Sunday afternoon.