From Hiroshima, take the Sanyo Expressway SW towards Iwakuni. Take the Sanyo Expressway west towards Iwakuni. The toll will be around 1800 to 2200 yen, depending on where you enter the Sanyo. Get off at Exit 35, Kuga, and make a right (it says Rt 2). Follow this winding road through town for about 5 or 10 minutes. You'll arrive at a traffic light where you'll see a green roofed gas station on your right. The roof says "Auto Base". Make a slight right at this intersection (not the immediate right). The road will fork shortly after, take the left fork into the mountain. After about a minute or so, you'll approach a busy area with a large parking lot and banners all around. Turn left into the lot and park there. Sanzoku is near the center of the lot. You can enter their main building, or walk down the stairs to your right to the outdoor picnic table seating area.