It's quite hard to recommend wineries to visit, as everyone has different tastes, level of interest, etc., etc. In general, I don't think there's much point in tasting grocery store wines here. I do think you should have a plan, rather than pick wineries out at random (which is okay when you have some spare time). For appointment only wineries, I believe you really should already be a fan of that winery's wines. – Jack
P.S. Not many are listed for Napa Valley because our favorites don't have tasting rooms; either too successful or too small. Plus, the
high tasting fees are a turn-off.
It's big! It's huge! It's a brand new monster castle! Presenting Castello di Amorosa in St. Helena for your touristic pleasures.
Winery Visits: Northern
Napa Valley
Tasting Room: Chateau Montelena, Schweiger, Tin Barn
Requires Appointment: Pride, Keenan (both can be visited last minute-ish if they're not too busy, so don't be shy)
Winery Visits: Mid-Napa Valley
Tasting Room: Ballentine, Robert Sinskey, Miner Family
Winery Visits: Southern
Napa Valley
Tasting Room: Spelltich
Winery Visits: Sonoma Valley
Sonoma Mtn
Tasting Room: Robledo, Audelssa (Glen Ellen), Gundlach Bundschu, Kunde, Ravenswood
Winery Visits: Russian River
Tasting Room: Rochioli, Porter Creek, Martinelli, Arista, Woodenhead
Note: Wineries like Rochioli and Martinelli, for example, only sell their less-expensive wines in their tasting room – their top wines are sold on allocation to long-time customers. Hint: Go in March-May for Rochioli Estate Pinot Noir. Go to Martinelli for Barrel Tasting weekend in March (to get Zin). Rafanelli is also open that weekend!
Winery Visits: Dry Creek Valley
Alexander Valley
Tasting Room: Ridge, Lambert Bridge, Preston, Michel-Schlumberger, Forchini
Winery Visits: Healdsburg area
Tasting Room: Acorn, Rosenblum, Limerick Lane

Mayo Family Reserve Room
Wineries Doing Food & Wine Pairing Tastings
It was started by
J Vineyards & Winery, south of Healdsburg, and wasn't a big thing until The Wall Street Journal wrote up the first of two Mayo Family Reserve Rooms (Healdsburg and Rt 12 Sonoma Valley). They have a $20/person pairing tasting: 8 Mayo Family wines with 6 appetizers.
St. Francis on Rt 12 Sonoma Valley is now doing this, too ($20/4 appetizers). Not a winery we recommend, however.
Swanson Salon in Rutherford, does a fancy pairing for $25-$55, Wed-Sun, 11, 1:30 and 4.
Patz & Hall Salon - $35, includes single vineyard Pinot Noir and Chardonnay wines, and seasonal food "complements."
Also, Pine Ridge Winery does a $40 wine & food pairing on Sundays thru October at 11am.
This is not a complete list!