Final answer:
The Navajo Sandstone can be best seen at Zion National Park, which is renowned for its expansive cliffs and canyons characterized by this geological formation.
Step-by-step explanation:
To see extensive outcrops of the Navajo Sandstone, you would want to visit Zion National Park. The Navajo Sandstone is known for its beautiful cliffs and canyons, providing stunning landscapes that Zion National Park is famous for. While the Yosemite and Grand Canyon national parks also offer incredible geological features, the Navajo Sandstone is particularly prominent in Zion National Park, making it an ideal destination for exploring this geologic formation.