I agree with CS when it says that this movie is unoriginal, but kids will love it. It has a cute dolphin and an adorable dog. The best part of the movie are the underwater scenes.
Sure, this movie is predictable to adults. But it is very enjoyable for children and just not that hard to sit through. If you have children in the 6-12 range you know it can be challenging to select a film that's not too scary for the little ones and not too babyish for the bigger ones. This one works for the group.