Looking for some winery suggestions for Today! what are some notable wineries which we can visit on short notice.

What region are you in?

Sorry about that. Napa/St Helena

No appointments needed:

Montelena
Mondavi
Duckhorn
Nickel & Nickel
Berringer
Rombauer
Copolla

These are the "big" ones.

I suggest you drive south on 29 from St. Helena down to Yountville, cut across to the Silverado Trail and head north to Calistoga, and then south down 29 back to St. Helena. You will only have a few thousand wineries to choose from.

Here's a pretty good interactive map for the area.

Click on "Napa Valley Map" on this page.

The fun part of napa is driving around and finding new stuff. Check out Cliff Lede. See the views from Joseph Phelps. Drop into Havens. Heck, just drive into a random driveway and taste the wine, that's the beauty of it!