Diablo lake trail was nothing less than perfect! The trail itself is about 80% shaded, not too rocky and incline was just enough to get the heart rate up. Most believe that the trail ends at the look out point… no way! Make sure you look to your right when at the end of the trail and go down to the bridge. If you really want an experience, venture out and go straight on the trail when down before the bridge…. Follow the sound of the water fall. The trail to the water fall is tight and all rock, waterfall terrain so be safe. Be careful when jumping these rocks to get down to the beach. You can see the beach from the bridge to the the left side of the damn. It’s beautifully peaceful and powerful. Our dog loved fetching sticks and swimming. I enjoyed cooling off myself. Not sure if you can swim here or let dogs in water but there were no signs that said otherwise.