My 2.5yr old loved dreamworld. They have wiggles world where you can drive the big red car through the wiggle house. The characters come out and do a show and then you can have your photo taken with them. Theres an animal park there with kangaroos, koalas, snakes and all the fun animals. Theres a paddle steamer in the river you can go on. Dora and Diego, spongebob and his friends come out for photos, theres a kids theme park in there too with merry go round and other kids rides and then if you have enough adults you can go on the big rides too.
I havent been to seaworld in about 2 years but its great there too, it has seasame street area with all those characters and they also have kids rides, and then all the animals
Dont know if I help at all, it depends on whether you child knows and loves the characters from either park or is a big animal kid.