"Grinnell is perhaps the most famous glacier in the park, and the out-and-back hike to reach it is steep. But the views don't quit here, with vistas of beautiful Grinnell Lake, waterfalls, and Salamander Glacier. This trek usually takes five hours, but you can shave off some of that time by taking the shuttle boat across Swiftcurrent Lake and Josephine Lake, making the hike only 7.5 miles roundtrip. Make noise while you walk as this area is prime grizzly bear country."