Stanley Glacier
Very nice and quiet trail. If you go by HW 93 from Castle Junction, about 4km after Continental Divide on the left side there is a small parking lot, cannot miss it, – the trail starts from there.
Very moderate incline through the forest with openings here and there; if you come early you’ll enjoy the sun on surrounding mountains.
You cross a small bridge, then hike deeper into the canyon, and eventually it opens up with a gorgeous valley and cirque of mountains surrounding it. The official (family friendly) trail ends here (there is a sign warning about it), but if you have an extra hour or two, you must go further.
The trail climbs up, makes a loop above and around the valley, and returns back to the sign. You can do it either CW or CCW, like we did; there are some sections with losing scree which are easier CCW, – but nothing technical, totally doable. We’ve been there in October, and waterfalls were almost dried out, but in summer you may need to cross a few small creeks if you want to get closer to waterfalls.
On the right side, right after the CCW trail gains some elevation, there is a cave: 
More photos are here: