The Grand Canyon is really grand. When standing on the ridge of the canyon and looking 1 mile (1600m) down to the river Colorado that created all this, you do owe the river a lot of respect. It is possible to walk all the way down and back up in a day, what can be recommended.
Bryce Canyon National Park is a national park located in southwestern Utah. The major feature of the park is Bryce Canyon, which is a collection of giant natural amphitheaters.
Zion National Park is one of the great national parks in Western USA featuring geological wonders, basins, rivers and walking ways.
Yosemite National Park is one of the most famous parks in the US. Yosemite is best known for its granite cliffs, waterfalls, clear streams, giant sequoia groves, lakes, mountains and biological diversity. El Capitan, the face of the park, is a giant rock towering over the park.
The Yellowstone is the oldest National Park in the USA and hosts a wide variety of animal life (incl. bears and buffalo) and vegetation. The natural beauty will make quite an impression. Beneath the Yellowstone there is volcanic activity that causes many hot pools and geysers ("Old Faithful").
Grand Teton National Park is a great park not far from Yellowstone with similar wildlife, but without the geothermical experience.
Death Valley is one of the driest and hottest places on planet earth. It is also the lowest point in North America. Less known: you can also find the "Devil's Golf Course" here, where you for sure lose your golf balls.
Arches National Park (near Moab) is an area with many rock-formations with some in the shape of an arch (curved with hollow space). Quite pictoresques. Arches N.P. is close to the village of Moab, a starting point for different adventures...