Drive the Beautiful South Side Scenic Loop.
The Black Canyon of Gunnison is know for 2000 foot cliffs and a beautiful raging river below. The south side of the canyon is the most popular and the easiest to get to. The visitor center is also on the south side making it convenient for information and getting souvenirs. The scenic drive also has 12 easy to get to overlooks.
The overlooks vary in length of walking but are mostly all on flat ground making it easy for anyone to get too and safe for kids to be there. Because of the very large cliffs there are not a lot of hiking trails in the park so the scenic drive is the best way to see the most of the canyon. The scenic drive is ~12 miles roundtrip making it not too long for a quick time frame and long enough to take most of the day. The deep contrasting colors of the canyon walls make for beautiful pictures especially during sunset.