Grand Canyon

Measuring roughly 277 miles long, 18 miles wide, and a mile deep, the Grand Canyon offers plenty of outdoor activities for everyone from day-trippers to adventure junkies. Hike along the national park's popular Rim and Bright Angel trails for unparalleled vistas, cool off with a whitewater rafting excursion down the Colorado River, or view the dramatic Arizona landscape from above during a helicopter tour. If you're feeling especially daring, sign up for a skydiving excursion above the canyon.