From Dave Zabriskie, a pro for Garmin/Chipotle: Go up Mandeville Canyon Road, which dead ends--but a decent little chunk of dirt will take you up and over to Sepulveda Boulevard. It's a nice little loop for a mellow day without much traffic, which is rare in Los Angeles.

START: W. Sunset Blvd. and N. Mandeville Canyon Rd. (dirt connector at top). Right on Mullholland Dr. Right on N. Sepulveda Blvd. Right on W. Sunset Blvd. END: W. Sunset Blvd. and N. Mandeville Canyon Rd.