Haven't had the pleasure of visiting Tasmania yet and don't know much about the place, but I've noticed you can also get those Smartvisit cards -
See>Tasmania. Perhaps there is something you can find on there for the kids?
On an unrelated matter, just had a look at Hobart's weather forecast for FRI 26th OCT:
Forecast for Friday :
Showers developing and becoming frequent at times with possible hail later. Snowfalls to low levels about the mountain and possibly the higher suburbs at night. Becoming colder with moderate to fresh west to southwest winds.
Precis: Showers and mountain snow. Min 08 Max 12
Yikes
Enjoy your time there...