It's against the law to ride on the side walks here. From the DMV Handbook:

Bicyclists:
must ride in the same direction as other traffic, not against it.

must ride in a straight line as near to the right curb or edge of the roadway as practical— not on the sidewalk.

must make left and right turns in the same way that drivers do, using the same turn lanes.

may legally move left to turn left, to pass a parked or moving vehicle, another bicycle, an animal, or to make a turn, avoid debris, or other hazards.

may choose to ride near the left curb or edge of a one-way street.

may use a left turn lane. If the bicyclist is traveling straight ahead, he or she should use a through traffic lane rather than ride next to the curb and block traffic making right turns.

are lawfully permitted to ride on certain sections of freeways, when signs are posted. Be careful when approaching or passing a bicyclist on a freeway.

Drivers must:
look carefully for bicyclists before opening doors next to moving traffic or before turning right.

safely merge toward the curb or into the bike lane.

not overtake a bicyclist just before making a right turn. Merge first, then turn.