LegoLandia was the park that my children enjoyed the most. I have two boys, one from 08 years old and one from 06 years old. They enjoyed it a lot. But pay two days to go to LegoLandia I think a lot.
With one day is enough, the shows are repeated in such a way that you can enjoy all that day.
If you arrive at the opening time you can get to tour the entire park.
Not for me. You can do everything in one day, if you plan to be yesterday from morning until night. Maybe you can finish early.
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