This hike is listed as easy and can be done with children. You hike through a Douglas fir forest with some interesting rock formations as well. From the top you can see the McKenzie River Valley as well as the Three Sisters.
UPDATED: I've now added the King Castle Trail to this hike. It is much longer and starts just outside of the town of Rainbow at POI #5.
The King Castle Trail is a lot of fun to ride down. You can pay for a shuttle ride from the nearby McKenzie Mountain Resort, or take two cars parking one at POI #1 and the other at POI #5.
To get here take McKenzie Highway 126 45 miles east of Springfield and turn right on Auderheide Road 19. Keep left on Road 410 toward the Cougar Dam powerhouse. Turn left onto Kings Road 2639 for a half a mile, then right onto Road 480. Take this gravel road 5.8 miles until it ends at the parking area.
For Kings Castle Trailhead: Take McKenzie Highway 126 45 miles east of Springfield and turn right at the town of Rainbow on McKenzie River Drive(first street past Auderheide Road 19. Turn right when you come to a covered bridge and cross it. Turn left on NF-2639. The trailhead will be just down this road on your right.