From the North or South:
take HW 101 to the San Ysidro Rd Exit. Turn left on San Ysidro Rd and go to East Valley Rd.  Turn left and then take another left into the parking lot just past the church courtyard.

Coming from Santa Barbara, if southbound traffic is heavy due to holidays or accidents, it is faster to exit at Hot Springs, and follow all the way up to take a right onto East Valley Rd.  The church parking lot will be on your right before you have passed the church itself.