Living in Napa, we have to go to Sonoma to get away. When searching for places to stay I found Stay Sonoma very helpful.
They have a great deal of information on a ton of places to stay when visiting Sonoma. There are amenities listed as well as room rates, and other pertinent information to help you make your decision.

There a few companies in Napa that have begun walking tours of the downtown area.

It certainly is a great way to here about the history of Napa, especially the town of Napa as opposed to the history of the wineries, which you can get from visiting wineries up valley.

Now if you are truly interested in a walking tour of Napa, then there is really only one choice. At a reasonably priced $20, Napa Walking Tour (707) 694-5097 offers a guided tour twice a day.

If you are looking for a little quicker pace and not so much work then you can ride a Segway and get your Napa tour at the same time. This company (Segway Napa (707) 254-9773) offers more options in types of tours.

Finally if you really want an experience, taking a horse in buggy through downtown napa will really bring you back to another era in Napa. This Napa downtown tour can be scheduled at your convenience, but an evening ride would probably match the mood best. You’ll have to call the Napa Valley Carriage Company (707) 320-7475 because currently their website does not have information on the downtown tour.

The Oxbow public market has opened selling fresh produce every day by individual farmers. Check the outside wall facing copia. Spaces are available for anywhere from a month to a single day. See the Oxbow Website for detailed information. There are also many special deals for locals on Tuesday nights from 5 - 8 pm.