Oh, and I just remembered Bli Bli castle! Its near Noosa and is wet weather friendly. Its not good if you get claustrophobic but its a rather unique attraction!
And the Ginger Factory at Buderim is also close to Noosa. Its been done up and has a great undercover cafe and ice creamery and shop selling all kinds of ginger products. There's a steam train and an indoor ride 'Overboard' which has to be experienced to be believed. Its a lot like Its a Small World at Disneyland. We love it but be warned the song will be stuck in your head for days.