The Almaden Cycle Touring Club (ACTC) promotes off and on road cycling in the Bay Area for all age and skill levels. ACTC is a volunteer-based non-profit organization emphasizing the social, recreational, transportation and health aspects of cycling. They offer over 150 rides per month. Guests are welcome on club rides. They also have events like dinners and parties where you can socialize with other club members.
The Grizzly Peak Cyclists is a Berkeley-based group that hosts about half their rides in the East Bay and the rest are all over the San Francisco Bay Area. Their club includes novices, intermediates, advanced riders with a range of rides that involve socializing and eating as well as a full day of riding.
The Valley Spokesmen are a San Francisco Bay Area bicycle club based in Dublin California. They organize local and non-local mainly on road rides that range from short neighborhood tours to strenuous century-length rides. They have a group within the club called The Feather Pedals that is a no cost cycling group that organizes group rides for women.
This club has more than 900 members covering all ages. Guests are welcome on club rides, unless the ride description specifies for members only. Rides are rated on pace, distance and amount of hills.