Seattle Wine
When people think of visiting wineries, they probably imagine sweeping vineyards and pretty buildings that house the winery. This is true in Washington, but not super close to Seattle. Washington's main wine country is across the mountains in Eastern Washington. Some are as close as a day trip, but most are several hours away. There are, however, several wineries that are located in Woodinville on the eastside (aka across Lake Washington towards Microsoft country) that are worth visiting despite their lack of vista.
The two main wineries are Chateau Ste. Michelle and Columbia which are conveniently located across the street from one another. Columbia is in the process of moving closer to their grapes, so this summer might be the last time to visit them in the area. Both offer tours of their facilities and tastings for a small fee and are a great place to start any Woodinville tour. The other, smaller wineries are all clustered in the immediate vicinity and are the real reason to tour the area. Most are tiny and aren't widely distributed outside the state and yet are very high quality.
You can hire a tour bus from Seattle to take you over to the wineries, but they will all take you to the big two and probably only one or two of the smaller venues. To really see something you won't get at home, it would be easier and cheaper to designate a driver and make your own tour. The best resource for planning a trip is the Woodinville Wine Country Web site which gives details of all the local wineries (with map!) and the hours their tasting rooms are open and is also the host for the majority of the events that happen throughout the year.