The National Park Service is turning 99 years old on Tuesday, August 25. To celebrate its not-quite-centennial, the Park Service is waiving entrance fees at all 408 of America's national parks that day.

That includes Grand Canyon National Park, which notes in a news release that the fee waiver applies only to entrance fees. Fees for camping, guided tours and concessions will still apply, and if you plan to be in the park beyond the 25th, you'll need to pay the regular entrance fee.

One day, though, is plenty of time to hike the Hermit Trail and have a meal at El Tovar Dining Room.

To locate a national park or monument near you, visit the Park Service's Find Your Park page.

Photo: Rebecca Wilks | Grand Canyon