Island in the Sky, Canyonlands National Park, is great.

But the view is even better from Dead Horse Point State Park.

I stayed in the fantastic campground there. Blue-haired mobile home veterans told me it was the best car campground they had found in canyon country.

The park is so named because of its use as a natural corral by horse thieves in the 19th Century. The plateau drops off with sheer cliffs several hundred meters tall on 3 sides, with only a narrow neck of land (30 yards or so) connecting the plateau to the main plateau. Thus it was easy for rustlers to simply fence off this narrow neck, and keep their horses from running away.

Unfortunately the dry desert conditions, lack of food and water, and limited space often killed the horses.

Dead Horse Point State Park – Wikipedia

Colorado River