From San Francisco, Berkeley area:

Take Hwy 24 East through the Caldecott Tunnel.
Take the Orinda / Moraga exit.
Go straight onto Brookwood Road.
Orinda theater Square will be on your left.

From San Ramon, Walnut Creek area:

Take Hwy 24 West.
Take the Orinda exit onto Camino Pablo.
Take the 1st left onto Brookwood Road.
Orinda Theater Square will be on your left.

Also easily accessible from the Orinda Bart station.