Top 10 National Park Activities

Yosemite is a rock climber's paradise with craggy outposts and multiday dome excursions.

Hikers can set off on a great adventure any time of year in the Great Smoky Mountains National Park.

You'll want flippers, a mask and a snorkel to explore the best trail in St. John because it's actually underwater.

For an intimate tour of Glacier Bay National Park in Alaska, glide through the waters in a kayak.

Set off on a modern-day treasure hunt orienteering at Prince William Forest Park in Virginia.

Spelunkers can descend 300 feet down 670 stairs on the Grand Avenue Tour at Kentucky's Mammoth Cave National Park.

Experience the wild badlands of North Dakota's Theodore Roosevelt National Park on a horseback ride.

Who says you can't ski in the summer? Rocket down sand dunes at Great Sand Dunes National Park in Colorado.

To truly experience the grandeur of the Grand Canyon, set off on a white-water-rafting adventure.

Enjoy a safari at Yellowstone National Park, home to more than 60 types of mammals and 318 species of birds.