One of the simplest of the "Easy Adventures" from the film, The Narrows is quite simply the Virgin River as it cuts through same of the most amazing towering rock canyons you'll ever experience. For the easiest route, enter Zion National Park and take a shuttle to the Narrows Trail Head at the Temple of Sinawava. Just like in the film, you get dropped off from the shuttle at that stop, then hike less than a mile to the Narrows trail head, As you walk the easy, flat pre-trail, you can look around to get a little sample of what you'll experience once you get to the Narrows, with red canyon walls and some "weeping" walls along the way. Once you get to the actual river trailhead, it's pretty simple: get in the water and walk! The majority of the hike is all pretty flat, but the river is rocky, so a hiking stick or two really helps your balance, as well as water shoes. You can rent those in the park at the entrance shuttle stop, or outside of the park at places like Zion Adventures, as featured in the film. Then walk as far as you can stand, the walls changes back and forth in style and look as you go, it's really an amazing feast of what nature can create with simply water and rock over millions of years. The best time of year to go is probably the summer (more crowded) and early fall (less people), when the river water level goes up to the ankles and feels amazing in the usual summer/fall heat, along with the cooling shadows of the canyons. Winter and Spring are really tough times to go as water levels can get up face levels, and you'd need to rent a dry suit to avoid hypothermia. 

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If you just want to take it easy or have kids, you don't have to go far to see beautiful canyon walls and small weeping waterfalls, literally just a few steps ahead, so take your time and enjoy a short hike.