Any ideas for free or cheap rainy day outings we can do this long weekend in the brisbane area which are appropriate to take a 9 month old to?

We were meant to go on holiday this long weekend but had to cancel cause dh lost his job. Both of us are disappointed at having to cancel our trip away & had planned to do nice things instead such as going to the beach & picnics etc. Now its raining all weekend but we want to do something as opposed to sitting at home.

Ive googled but cant really find much, dont feel like a 40 minute train trip into the city in the rain.

Anyone have any good ideas?