While Disneyland is supposed to be the funnest place on Earth, and is the most popular theme park, we decided to take our kids to Legoland on Spring Break. I don't regret it one bit.
Although the park is not open as long as Disneyland, it still worked fine for us. When you are travelling with small children, who wants to get to the park before 10:00 and stay much later than 5:00 anyway? We also noticed that Legoland has a more mellow vibe than Disneyland. The music wasn't as loud or crazy, and the park was full of families with young children. In other words, perfect.
While I look forward to experiencing Disneyland through my kids' eyes some day, I have to say that Legoland did not disappoint and it was the perfect choice for us this year.