Kesselfallklamm (30 mins from Graz) is the smaller sister to the Bärenschützklamm, making it great for younger kids. It’s a beautiful shaded canyon where you climb up steps and criss-cross over the canyon river and waterfalls using 52 bridges and ladders (my kids counted them all!). You then circle back down on a path through the woods. It can take between 1 to 2 hours depending on how small the legs are. There is also a good Gasthaus (restaurant) at the beginning with a playground and goats. Very useful for bribing the kids with ice cream afterwards!