As I have mentioned before, I am not much of one to recommend a movie... But "Journey to the Center of the Earth" is AWESOME!!! Totally.
However, it is best in 3-D totally cool.
The only halfway questionable things were;
1. The thirteen year old tries to call "dibs" on the mountain guide.
2. At one point, the boy says "We are in deep schist" (a type of rock formation)
3. There are parts that are "intense" a little scary for young kids.
I totally recommend it. I have seen it twice, once in 3-D and once not. It was better in 3-D.