As I recall the glacier is visible from the road end and once you start up the North Fork trail you lose sight of it until after you get past the second or third lake. Here is a map link:
http://angeles.sierraclub.org/skimt/trips/palglr99/PalGlac-map.htmIf you have the energy and time to hike to Sam Mack Meadow I think you will be in good position to view the glacier. I haven't gone beyond second lake myself.
This is an up and back trail, not a loop, and can be done in a full day.