I do have a question for those who have gone.
I know you have to leave your shoes for the slides- are there any that you can wear shoes on? Water shoes or crocs or something? The water coaster maybe?
My youngest is JUST at 42". Maybe even 41.5ish. We go next month. She can ride 42" rides here at six flags with just regular tennis shoes (no thick bottom or "napkins"). So a legitimate 42"- so will be able to do gringots, MiB, etc because she'll have shoes on. But she won't be 42" on shoeless water rides unless she grows half an inch in a month. Possible, but unlikely.
So with that said- if she can ride the water coaster with crocs on or something, that'd be great news.