3.8 miles, 1-3 hours
This is a relatively easy less-than-four mile hike to a 40-foot waterfall. Its proximity to civilization and short distance make this a very popular trail for casual hikers, and it can get very crowded on the weekends and on hot summer days - but it's worth a visit even if you have to fight through crowds - especially when spring wildflowers carpet the lower portions of the canyon floor.
This family-friendly trail will be easy for most, although it gets more rugged the closer you get to the waterfall. There are several stream crossings and areas of boulder-hopping, but they should be manageable for most people.
There is also an excellent Nature Center near the trailhead, with great exhibits and many free presentations for those who are interested.
Try to hike during a weekday, when you won't have to deal with as many other hikers. If you can only hike on a weekend, get to the trailhead as early as you can.
The area near the Eaton Canyon Nature Center and the sections of the trail before the actual canyon have plenty of wildflowers in the spring. Don't forget your camera!