Here are your directions, if coming form the Bay Area

Take North on Hwy 101, About 5 miles North of Ukiah, take Hwy 20 East towards Upper Lake (Exit 555B), go about 18 miles, 

turn Left onto Witter Springs road, go 1+ mile, turn left on East Road, go 1/2 mile we are on the Right

You'll see a red sign of 10528, make a right after that you will get to the retreat.