Use sunset as your turnaround alarm.
Plenty of people stop at the paved overlook by the parking lot and turn around, which is why the rest of the trail stays quiet. Walk the full mile out along the rim and the view keeps widening until you can pick out the White Rim road below, formations in the Needles and the Maze, and mountains on the horizon. The route follows the canyon edge on rough, uneven rock with stone steps, so keep kids close. There is no potable water anywhere on the trail, so fill up at the visitor center.
Rim walk over the entire Island in the Sky ending at a jaw-dropper.
Heat note: desert country - in summer start at dawn and carry more water than feels reasonable.
Water bottle, sunscreen, hat, snacks, comfortable shoes.
Make it a weekend: Willow Flat Campground (Camping, 5 mi) · The Needles Campground (Squaw Flat) (Camping, 12 mi) · Kayenta Campground (Dead Horse Point) (Camping, 14 mi) · Ken's Lake Campground (Camping, 26 mi)
More hikes nearby: Mesa Arch (Hike, 5 mi) · Upheaval Dome Overlook (Hike, 9 mi) · Chesler Park Loop (Hike, 12 mi) · Druid Arch (Hike, 13 mi)