Encounters with wildlife can be a real concern, even on short, front-country hikes. Bears, moose, caribou and other large animals are common in the park, so be sure you know what to do should you run in to one. Ask the park staff if you're not sure.
Some of the hikes in the park can be challenging, and weather conditions can change rapidly. It's a good idea to always carry plenty of water, some food, and rain gear.
fees/permits
There is a daily entrance fee for the park, as well as additional fees for camping, backcountry hiking, and so on.