Heading South on Rt 680:

Take the North Main/Walnut Creek exit.
Get in far right-hand lane and go south on North Main.
Turn left onto Ygnacio Valley Road and proceed about 1.2 miles.
Turn left onto Marchbanks Drive  and drive for 0.6 miles.
Go up the hill, past a stop sign, and turn left into the parking lot at the Gardens at Heather Farm.  The entrance to the building is just off the parking lot.

Heading North on Rt. 680:

Take the Ygnacio Valley Road exit.
Turn right onto Ygnacio Valley Road.
Follow the rest of the directions above starting with "Turn left onto Marchbanks.."