From the Bay Area:
Take 101 North to River Road, exit 494.
Turn left onto River Road, and proceed ~15 miles. You will pass through the town of Guerneville before coming to Monte Rio.
Pass under the sign "Monte Rio--Vacation Wonderland" and turn left to cross the bridge.
Take the first left after the bridge onto River Blvd.
The big blue house is about 1 mile down on the left, 20280 River Blvd.