I was looking for something to do with my young one and Legoland seemed to fit the bill. This is not a theme park, by the way, there are only 2 rides. Instead, there are several rooms where kids play with Lego pieces, encouraging them to be creative.
The one thing that I found amazing was the Lego 4D cinema, which rotates a movie every 30 minutes, giving you an unlimited movie experience in 4D. If you are wondering about 4D, then you have to check out this place.