At Griesner Alm in Kaiserbachtal cross the brook to your left and follow the wide trail towards Stripsenjochhaus. After a sharp right turn inside the forest, pick up a trail to your left and follow the signs to Fritz-Pflaum-Hütte - Ackerlspitze. Take the left hand trail, which zigzags up to the huge and beautiful Griesner Tor cirque. Further up keep to the right and continue to Fritz Pflaum Hütte. The hut was built in memory of Fritz Pflaum, a prominent alpinist who loved the Wilder Kaiser mountains.
To get back, continue to Griesner Kar. At the first junction with signs walk down to Kleines Griesner Tor and continue to Kaiserbachtal. Follow the supply road back to Griesner Alm.