We went last week with our 9.5 year old son who loves Legos. We'd been once before when my son was 4 and we weren't overly impressed. Now that my son is a huge
Lego fan I decided we needed to hit the park one more time.
It is expensive. Like someone said, check the discounts thread. I did buy one adult ticket with the Barbara's bakery link, $49! I was planning on using the coupon from the Lego magazine for buy one adult get a child free. I didn't know until we got to the gate that we had to buy a park hopper for this deal. I swear I read the fine print over and and over, I thought I could buy a one day/one park ticket. So it ended up costing $101 at the gate, so $150 for the 3 of us for the day. I would have saved more by pre-paying all of our tickets through the Barbara's bakery link. (Not sure if it's still available) Plus $15 parking.
We got there right at 9:30 and we were done by 4.
Your son might like the Mindstorms class. We weren't at the front of the park at opening so I didn't get to try to sign up until noon and the classes were full already. We got on the waitlist for the last class but it was full.
We really liked the Lego Movie Experience, that and Miniland were probably the coolest things there.
My husband wasn't a big fan of
Legoland the first time but he didn't really want to miss this visit now that our son is bigger. He still didn't enjoy it though. I think it's an OK park but a little pricey for what it is.
We didn't go to the aquarium but we've seen it before and we have a Sea Life (same chain) aquarium in AZ that we have visited as well.
The water park is probably cool but I just bought water park season passes for our home park in Phoenix so I couldn't justify spending more money for just a few hours.
They didn't check our backpack and I packed bottled waters, PB&J, apples and nuts for us. We only spent $6 on the Apple Fries. So we saved money on food.
Good luck! Many of the things you'll see there are cute and unique to the Legoland experience.