Starting from the Gästedorf you Need to drive half an hour by car to get to Reichenau an der Rax. There is a huge Adventure Park with much to offer for the whole family or the entire Group.
More Info directly on their Webpage:https://www.magicadventures.at/
If you drive in the other direction (direction Graz) you can ride boats etc. on the Mur river. More info on their webpage: http://www.flusswandern-mur.at/
Ist worth the ride!!!!!!!!! .. if you are brave enought 🙂