the easiest route is to start at the info board for the west glacier trail. go to the far side of the gravel clearing behind the board. there is a trail that starts there. follow this trail for a few hundred feet until it goes up a small rise and splits at a t-intersection. you want the trail that turns off to the right. Trail looks to be more or less well traveled, but watch out for mountain bikers. They seems to have found this trail, and have built some jumps in some places.
i don't recommend going cross country as there are very steep slopes and lots of bushwhacking that the trail mentioned bypasses. please do not pick through the ruins as the cache is not hidden in them. good luck.
This message is from the Heritage Program staff at the Juneau Ranger District, Tongass National Forest. The Forest Service manages this area for its historical values and it is protected by federal laws. Please remember to leave ruins and artifacts completely undisturbed. Take only photographs and cherished memories. You are a valuable steward of Juneau’s unique and enduring history.