Day 2. Recently made my first trip out to Santa Barbara- nice place. Actually if time ran short, would spend more time there and drop Morro bay. Keep in mind this time of year it's going to be getting dark by 7pm. So the Big Sur, part make sure you take in the sights first and save dinner for the end. Weather wise- Oct is the best time for the central coast. Summer the marine layer may only burn off for a few hours in the afternoon.
Day 3. Sounds good.
Day4. Made it out to the Exploratorium, it cool but better suited for the kids I took. Golden Gate park on the other hand, they recently redid the Academy of Sciences and de Young and worth the stop. If you do go to the Exploratorium, the Place of Fine Arts, is right there and should be checked out. In crossing the Golden Gate bridge, Sausalito is a nice town to visit and have lunch.