The hike to Grinnell Glacier is a must-do!!! Literally my FAVORITE hike and arguably the best hike in the park! With stunning alpine scenery, wildlife sightings, and the chance to see a glacier up close, this 10.6-mile round-trip trek offers a little bit of everything. Whether you opt for the full hike or take the boat shuttles to shorten the distance (we did the full hike), be prepared for jaw-dropping views, steep climbs, and the possibility of spotting moose, mountain goats, and even bears along the way (we saw a mama black bear with her cubs AND grizzlies) so bring your bear spray!