We’ve done this route a few times in the last couple of years. It goes through a rustic area many people are surprised to find so close to Beverly Hills and on a closed road in Griffith Park.
Cruise through WLA and BH to Beverly Drive and then to Franklin Canyon. Continue up to Mulholland. Short route riders go back on Sepulveda for 30 mild miles. Long route riders head east on Mulholland to Griffith Park. Take Griffith Park Drive to the closed (and minimally maintained) Mt. Hollywood Drive to the Observatory. Return to the Westside via Western, Fountain, and Santa Monica Bl. Should be about 50 miles with 3200 feet of elevation gain. One time we even stopped on the way back at Pink’s for ptomaine tube steaks!