Napa Valley is beautiful with all the rolling hills, vinyards with wine tasting. You may want to find a hotel somewhere outside of Napa, as it can really be pricey during tourist season. Monterey is an interesting town to explore. Go down to the last street by the ocean and you will find the Monterey Bay Aquarium and just a block south of that is the Forrest Gump resturant jetting over the ocean, and then all the great little shops. About 5 miles south of Monterey is Carmel. It's a beautiful town on the ocean and very dog friendly. You will see people walking their dogs all over town and the beach. They have a wonderful dog boutique called Diggidy Dog.
http://www.diggidydogcarmel.com/index2.html
We take in all the little towns and shops here and there when we go up to Morgan Hill and San Francisco to visit our sons, which we will be doing again on the 24th of this month for a few days.
Have fun and enjoy the peaceful Napa Valley countryside.