Replying to Who's hiked in Zion and Bryce Canyons? Help a Huck out.

There is a hike that I have only seen in photos. It's a slot canyon with water in it and you hike for about 8 miles wading. I know there is a hike called the narrows in Zion, but a friend told me there was one in Bryce Canyon.

My friend may have been talking about the narrows, but that is described as a two day hike of like 16 miles. I am looking for something cool that I could hike through with kids and their grandparents and make it through in a day. My parents are tough and can handle it.

Thanks in advance for suggestions.