You can visit parts of this US national park for free, but to get to the heart of the park, you'll have to pay. Here are your different options: -Private vehicle - $30 per vehicle (good for 7 days) -Hiking/biking in - $15 per person -America the Beautiful pass - $80 (good for a year, so if you plan on going to at least 3 parks anywhere in the United States in the next year, this pays for itself)