Is the PCH nice in February?
What part of PCH? It runs for over 600 miles. And where it doesn't run, the 101 takes over.
Coming down the 101 out of Oregon, you're basically in forests on the coastline. Lots of beaches and Redwood groves. Great hiking and camping outside of Crescent City on the Smith River and Tolura Dunes.
When you get to Humboldt there's great camping South of Klamath in Prairie Creek Park at Gold Bluffs Beach and some huge elk herds. From there you're into Humboldt with more Redwoods and the Avenue of the Giants. At Garberville you can head out to Shelter Cove.
When you get to Leggett you can break off the 101 to PCH and head through Westport, Fort Bragg, Mendocino, Point Arena and Jenner. At Jenner I'd take the 116 into the Sonoma County Wine Region personally and catch back up with PCH in SF. Go down through Santa Cruz, Monterey. Bixby Bridge is neat South of Monterey - you'll notice like half of the car commercials are filmed on or around it.
When you get near Hearst Castle check out San Simeon Beach. In the winter it has a giant Elephant Seal colony.
One thing about the drive from Monterey to Pismo is its twisting and turning. Fairly tiring drive and I've seen it make people car sick. If you want to go to Solvang you're better off to take the 101 out of Pismo.