I've got a suggestion - drive the Snake section of Mulholland Drive
http://http://www.twistypedia.com/ro...lland-highway/
So, instead of Topanga to PCH, take the 101 to Las Virgenes to Mulholland Dr, turn right to drive the Snake, stop at the Rock Store for a cold beverage, then take Kanan Dr to PCH. You can take Mulholland all the way to PCH, but there are stretches that are 1st and 2nd gear lock-to-lock curves - quite an upper body workout!
Enjoy.