Are you an experienced climber? You better be to climb the Blue John Canyon, where Aron Ralston was (and where James Franco pretended to be) trapped under a boulder for five days before amputating his arm. Not willing to lose a limb? No problem — the Canyonlands National Park offers several activities for adults and kids, including relatively safe hiking, biking, boating, and four-wheeling driving around the park. Entrance fees include $10 for vehicles and $5 for individuals (both good for seven days).