You won't be the only adult practicing their spells.
At that time of year, wearing a HP robe is very nice. You can wrap it around yourself in the morning for extra warmth and leave it open in the middle of the day. A hood is a hat that can't fly away. It also has a pocket to store your wand.
Our first trip, I made a Ravenclaw robe for DD, and a Jedi robe for DH. He told people he was a homeschooled wizard, so he didn't have a house color. I ran out of time for me and had to buy one there. I don't like it. The fabric is polyester. I'd been warned about that ahead of time, but I didn't worry since I'm not a fabric snob. The problem is that the fabric also FEELS like polyester. The hood is only almost wearable. It is a little too short and the long point makes the back of it heavy and it falls off. I am sewing a robe for myself now. If either of you can sew at all, I'd recommend that.
Another nice thing about that time of year, is that your visit might be when an unofficial Harry Potter event happens. There used to be an official event there, but Universal stopped doing it. I assume because the actors got older. So, then it went underground. I think they called it "The Event That Shall Not Be Named". We stumbled on it last year. A bunch of people cosplaying HP at the parks and there was a group photos