Unless you like to create your own trails, park at N37 15.039 W122 08.182. There is no trail to this cache from the Sempervirens Point overlook.
The hike from the parking spot is mostly downhill and about 1.2 miles. See the map attached to this page. There is a 400' elevation change. It didn't seem that steep except in one or two places when we were hiking back out. Once you get close, you shouldn't have too much trouble figuring out where we hid the cache.
The cache is in a medium-large ammo box.