Where to Bike Los Angeles
http://www.wheretobikelosangeles.com/

Some of the featured Adult rides are:

Santa Monica Beach Bike Path
The South Bay Bike Path
Las Flores Canyon
The Donut
Tour of Long Beach
El Dorado Park Loop
Shoreline Park
Surf City USA
Mulholland Drive
LA Landmarks Tour
Silverlake—Elysian Park
Arroyo Seco
The Rose Bowl Circuit
Mt. Wilson
Whittier Narrows
Upper San Gabriel River
Cogswell Reservoir
Griffith Park Loop
Rid de Los Angeles
Sepulveda Basin
The Orange Line Bikeway
Chuck Pontus Trail
Vasquez Rocks

Some of the featured Kids’ rides are:

Palisades Park
Burton Chace Park
Hermosa Beach Strand
Heartwell Park
El Dorado Park
Shoreline Aquatic Park
Echo Park Lake
Arroyo Seco
Legg Lake
Lacy Park
Lake Balboa