We have an annual pass to Dreamworld this year (had seaworld/movieworld last year) , Dreamworld have just finished a "new world" based around Madagascar , Shrek and kung fu panda , My kids loved this area , There is 4 or 5 rides in there , also they still have wiggles world. My kids loved the vintage cars which you all will be able to go on and there is a section with Australian wildlife.
Seaworld on the otherhand has less rides but better wildlife. The penguins , sharks and dolphins are great. My children who are 9 , 7 , 5 and 3 loved seeing the shows but got abit bored at times because there isn't heaps to do.