The Santa Monica Mountains, especially Decker Canyon Rd. , Encinal Canyon Rd. and the most hellish of all, Latigo Canyon from PCH to Kanan. (Don't look over the edge). Mullholland from Las Virgenes to Kanan is also a very windy but extremely scenic stretch. As always, watch out for the CHP. My favorite is PCH North through Malibu exit Los Posas then take Portrero Road all the way through Hidden Valley to Westlake Blvd. From there take a right which turns into Decker Canyon. That whole area is one huge fun zone for the sports car driver. Check the map and you will see how it would make sense.