Zion National Park in Utah is divided into two sections. If you only have one day, plan to spend it in Zion Canyon. In only 8 hours, you can tackle four great hikes and soak up some of the most spectacular views the park has to offer.
US National Parks Map - The World includes this great country too! I'm proud to say that my parents took us to so many of the National Parks when we were kids and I've added to the list as a grown up. Still more to see!