What ever you do, DO NOT just turn up and pay full gate price. You can buy lower priced print at home tickets from Asda in advance, from
here Not sure if you'll be able to do this from the US.
It's worth doing an internet search to find a money off voucher, this will take minutes and save you a fortune.
I've registered for free with a website called
Raring2go and they always have a discount voucher available, we last used in April with no problems, just print off the A4 sheet and produce it at the tickets gate. I think DH got in for £19 (instead of £39 on the gate) and the our youngest DD was £16
Myself and our 6yo have AP's as we go in the hols, we now have to pay for youngest DD as shes now 3 and DH but never ever pay full price at the gate. A family behind us last month paid over £120 ($220) for four of them to enter
Have a great time, I hope you enjoy Legoland Windsor