We went to Legoland in the Herbstferien and it was great. It was only a one and half hours drive, with a little complex route through Austria which feels like you are not actually going anywhere, but we arrived relaxed and excited to get going.
We stayed in a barrel, which was so surreal. And very cosy. The park itself was perfect for our girls, aged 7 and 9. I'm not sure it would tick all the boxes for older teens, but then again, myself and Graham had a ball. The rides were fantastic - full of surprises. The girls took a Legoland driving course and even got a license! (Poppy informed me that some 'didn't get a license at all!) We had dinner in a castle, with fabulous service and food.
The details are fantastic, with little lego men doing stuff around the park, getting stuck in cement, getting lost up pipes, appearing in unexpected places. Very funny. I heartily recommend a trip if you've not been.