This is a great loop of the bay area, but there is much more to see and experience. And, you can start your trip from anywhere on the loop, or the extension I would add.
The extension: Add a few days to your trip by following I-880 out of San Jose to Santa Cruz. Go south to explore the area around Pebble Beach and Monterey. When you get back to San Jose there is more to see by following Hwy 101 up to San Francisto along the west side of the San Francisco Bay. You won't be sorry.