Apart from the obvious driving through Big Sur and the dozens of sights along that route, near Pismo Beach there’s Avila Beach, Morro Bay, various wineries around Paso Robles. Heading north there’s Cambria, Elephant Seals south of Ragged Point, the various stuff to see through Big Sur. Then around Monterey there’s the Aquarium, Pacifica area, Carmel, beaches, Point Lobos State Park, Cannery Row, the Marina/wharf area and plenty of other things.
I suggest you have a look at the visit Monterey, Big Sur and Pismo Beach websites.