Our group of 6, ages 74, 72, 49, 23, 20 and 16 took this hike off trail loop. We take our time as we examine flora and fauna and enjoy. We don't believe that the time and difficulty are appropriately listed. If you are a young, nimble mountain goat and don't look at anything along the way you might be able to make it in the 3 hour time frame listed. Cardiac hill up Bluff Spring Trail was a breeze and offered great views. The first part of Bark's Canyon is very pretty and enjoyable with several areas of smooth rock areas with pools. Unless you are a mountain goat, don't go much further as it requires nothing but boulder hopping on large boulders. The youngsters went into the cave/prospecting tunnel. We saw many animal prints including deer in the sand around the pools. A slight amount of water was running and it was so cool to see the water cascading over rocks and get swallowed up by the sand only to reappear 50 feet later. We saw cotton tail rabbits, lots of Phainopeplas, a red-tailed hawk, a juvenile Sonoran Desert Toad and a scorpion.