From the North
Take Highway 101 South towards San Francisco.  Take the Petaluma Blvd. North exit and turn right onto Petaluma Boulevard North.  Travel 2.2 miles and Mister McGoo's will be on the right hand side.
If you reach the Payran Street stop light you have gone too far.
 
From the South
Take Highway 101 North towards Eureka.  Take the Petaluma Blvd. South exit and travel 4 miles.  Mister McGoo's will be on the left hand side. 
If you reach the factory outlet stop light you have gone too far.