i think caves are so breathtakingly beautiful so when we we came across a road named cave rd (in the margaret river region of w.a) we couldn't help but stopping by. we had a lovely little explore and i think a trip to mammoth cave or jewel cave is definately worthwhile. mammoth cave is a self guided cave where you learn through a mp3 you carry round and i felt like i learnt a lot listening to the mp3.
so if you're planning a trip to the area, there's nothing like a good cave walk :)
and if that's not enough exercise for the day you can always have a hit of tennis, a round of mini golf or a game of dodgeball!