We did this hike in the morning as we thought it was a bit chilly to do the narrows at that stage. It was a great decision as this is a nice hike when it's not too hot. The first part leaving from weeping rock shuttle stop is a steepish uphill climb with some very nice views. After the initial climb it becomes more fun, there's lots of scrambling over various obstacles and walking along sheer cliffs (with chains from the walls in some parts).
The 1 mile trail ends at the entry point to the Hidden Canyon, after that you can keep going into the canyon. It's quite narrow so you can't really get lost, but you should make sure you have plenty of water as there's none on the trail and you have to come back the same way. In the canyon there's various rock formations to climb and scramble over, which were fun but not excessively difficult for someone with a reasonable level of fitness. There is also a small arch down the canyon. We turned back after a while as we still wanted to do the Narrows that day as well so I'm not sure how long it went on for but we took about 3 hours overall including a couple of stops for food and pictures.
It was quite a nice break from the crowds in the national parks as well, as it's not a very busy trail. We encountered a few people but not very many.
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