We also really wanted to explore another side canyon back near where we parked, but we had already spent 4 hours there and still had to grab dinner (the Costco food court in Palm Dessert was the perfect inexpensive/quick place to stop), get gas, and drive home on some dark and rather windy roads after a long day, so we'll have to save exploring that other canyon for another time. (The boys said we should camp there sometime, which sounds like a great idea to me to get more out of it with such a long drive to get there).
The boys enjoyed jumping, climbing, finding hiding places, and bouldering. And we decided it would have been a great hike to take our dogs along on, except that a few of the ladder spots were too steep for them to climb up the side on their own, and we don't know how well the dogs could do getting up (or down) ladders??? We did see someone else there with a dog, and wondered how it had done with the ladders (but I did see that it had a little harness on it's back, and wondered if they just lowered it up and down?).