Cline Cellars. We often bring our young kids wine tasting, and Cline offers lots for them to do - animals, missions museum, pond, walking trails.
Quivira Winery. Interested in learning about sustainability or biodynamic farming, then this is a must-visit. These are cowhorns filled with biodynamic material that the winery buries until its ready for use. Seriously amazing stuff to be learned here.
Robinson Family Vineyards. Nicest family winemakers you will ever meet...and they make great wine. Such an amazing and intimate experience.