The Big/Little Zoo loop are two routes that start and end in the same place. If you are a slower (more relaxed) rider you can ride the Little Zoo Loop while faster riders or those needing more climbing and distance can ride the Big Loop.
Big Zoo Loop — 37 mi and 3150 ft climbing. Detailed map of route, gps download, and additional information here:
https://ridewithgps.com/routes/32945241
Little Zoo Loop — 26 mi and 2285 ft climbing. Detailed map of route, gps download, and additional information here: https://ridewithgps.com/routes/31399492
Start/End in TJ Max parking lot behind Peets Coffee, 20439 Redwood Road, Castro Valley, CA
The Cycling4Fun website list rides available in the bay area. This list is not frequently checked so road and environmental conditions are subject to change. Cycling is an inherently dangerous sport. Cycling4Fun does not assume any responsibility or liability for death or any injury, loss, or damage to you or your property incurred from your participation in any cycling or other event conducted by Cycling4Fun or by your relying on information contained on Cycling4Fun websites. These rides may be strenuous, hot, cold, in traffic, and otherwise challenging. Use good judgment regarding the ride and your state of preparation.