You all will love Universal.
You can't make reservations for Three Broomsticks or Leaky Cauldron for lunch or dinner. You just walk up get in line and give them your order.
If you want to experience the Potter parks first and if IOA is opening early for on site guest be there at rope drop and head to Hogsmeade right off. Ride the Forbidden Journey first then Flight of Hippogriff and then Dueling dragons. Take in the shops then be in line to get on the Hogwarts Express to go over to Diagon Alley as soon as they start running it over. You have to have a park to park ticket to ride the Hogwarts Express. Ride it both ways while your there because the experience is different in each direction.
When you get to Diagon Alley go straight to Escape from Gringotts then on to Ollivanders wand shop for the show. They pick youngsters out of the audience. Buy a interactive wand for the little ones to do magic at marked areas in both Potter Parks. The map for the magic spell spots is included in the wand box.
Get a butterbeer and wander around the shops and Knockturn Alley. Then have lunch or dinner at the Leaky Cauldron in Diagon Alley or The Three a Broomsticks in Hogsmeade.
Another lovely place for lunch is Mythos in IOA. The food is very good and you can make reservations on the Universal site under the dining area for this 30 days out.
If things are slow and there are not many folks there and you accomplish your Potter fix them you can focus on the rest of the park.. If it is busy you will be glad you have your Express pass..
Make sure to enjoy one of the Lard Lad Big pink frosted donuts in the Simpsons area.
And the Characters Scooby,Shrek, Simpsons, Transformers etc will be there for pictures..So make sure the camera batteries are charged. The Minion characters are there for photos after you get off the Minion ride. Hope this helps.
Have a great time.
