I hiked the Piedra Ice Fissures Trail. On the way up to the overlook, I found many large cracks in the ground (ice fissures). Some were 25-30 ft deep (estimate). The overlook was very nice. This trail is popular so it's easy to follow.I decided to hike the Piedra B and Piedra C on my way back and took a spur trail to another scenic overlook above Williams Creek. These trails are not marked or easy to find/follow.