Good sleuthing Jo -

Straight on Camino Pablo/San Pablo Dam Rd. and ride on gently descending hills into El Sobrante. The route then turns right on Castro Ranch Road and climbs through a residential area and descends to a right turn on Alhambra Valley Road. The next turn is a right on to Bear Creek Road which climbs three hills “the three bears”, and returns to the intersection of Wildcat and San Pablo Dam Road.
The "loop" I have done once, and will do tomorrow (if it's not pouring) is the one you describe but I start and end at my friend's house off Castro Ranch Road - no climbing Wildcat Canyon for me (3 bears and a cat?) or Grizzly Peak (3 bears, a cat, and another bear? )