The San Xing Temple (三興宮) is on the border of Gueishan District and Linkou. I often pass this place on my way to do a hike on the Da Keng Trail (大坑桐花步道). I call it The Mustard Temple because of its gaudy yellow color. There’s no need to enter the temple. The cache is on the wall outside the temple. Be careful of cars coming and going along the narrow street, it can be quite busy during the daytime hours!