Hiked up here in early July and spent two nights in the cabin. It's a sturdily built, well kept place, with a fantastic view of the glacier.
Note that the top bunks in the cabin are slightly smaller, and are thus not quite as well suited to sleeping two people abreast. We slept seven people there, just barely.
There are no intentionally constructed trails above the cabin yet, but since it sits right at the edge of the tree line there are great day hikes to be done on the mountainside. Be sure to see the waterfalls and ravine that the creek cuts through.