Glacier’s most popular trail is the boardwalk from Logan Pass  to Hidden Lake Overlook, a three-mile round-trip hike through delicate alpine meadows, home to marmots, ptarmigan, and mountain goats. The weather can be blustery up here, even in midsummer, and the 500-foot climb to more than 7,000 feet above sea level can be surprisingly fatiguing.
For a fairly level trail that goes on for miles, the Highline Trail can’t be beat. It’s the main route to Granite Park Chalet  (7.6 miles), and it can be frustratingly crowded, but the above-timberline views, bear-grass meadows, and chattering marmots are absorbing enough to eclipse the other hikers. (Do note that there are some high ledges to traverse here; people hiking with young children and those with a fear of heights might want to give this trail a pass.)