I ran a pretty incredible route in Zion National Park called "The Narrows". This is a classic route that goes from the bus stop, through rocks, water, with running, scrambling and some swimming to Big Spring. You pass through "Wall Street" which is sheer rock walls. I had a blast and really enjoyed it.
If you go during the summer, I was there on Memorial Day Weekend and I had been thinking of doing "Angels Landing" but it was too crazy/crowded so choose "The Narrows".
If you do this route, I highly recommend hiking poles or a stick. I found a stick at the start of the water section and I used it almost the entire run...I would also suggest a "dry bag". I got there on the 3rd shuttle so there were not too many people ahead of me but on the way back I probably passed 300 hundred people...it was insanely busy.
I didn't need much water but have a "dry bag" would have been great to keep my Iphone safe and anything you didn't want to get wet.
I highly recommend and think that someone can go much faster and I think if I had a "dry bag" I would have been about 10 mins quicker. I also stopped and snapped some pictures and took a selfie.
I hope this helps and so stoked we can get this listed.
Cheers,
Mike