* Known for its stunning granite cliffs, waterfalls, and giant sequoia trees.
* Popular activities include hiking, camping, rock climbing, and fishing.
* Grand Canyon National Park, Arizona
* A UNESCO World Heritage Site, the Grand Canyon is one of the most popular tourist destinations in the world.
* Popular activities include hiking, rafting, and mule rides into the canyon.
* Yellowstone National Park, Wyoming, Montana, and Idaho
* The world's first national park, Yellowstone is home to geysers, hot springs, and wildlife including bears, wolves, and bison.
* Popular activities include hiking, camping, fishing, and boating.
* Acadia National Park, Maine
* Located on the coast of Maine, Acadia National Park offers stunning ocean views, hiking trails, and wildlife including whales, seals, and puffins.
* Popular activities include hiking, camping, biking, and kayaking.
* Zion National Park, Utah
* Known for its towering sandstone cliffs, Zion National Park is a popular destination for hiking, camping, canyoneering, and rock climbing.
* Popular activities include hiking, camping, biking, and horseback riding.
These are just a few of the many popular parks to visit on holiday in the US. Each park has its own unique beauty and attractions, so there's sure to be something for everyone.