Just got back from Cambria, one of our favorite places,
Our favorite restaurants:
Linn's Fruit Bin - Cambria California
Home - Robin's Restaurant
+1 on the castle tour
What are you going to do in Pismo? If you are not going to go out on the dunes not much else to do there, I prefer Morro Bay, they have a nice beach, lots of nice restaurants, kayak and boat rentals.
Do you like wine? Cambria has a fun wine tasting room, huge number of wineries on the central coast, Paso Robles, Santa Ynez, etc.