I have a pretty stout 5-1/2yr old princess (45" and 42Lbs.) who wants to ride all the rides on her first trip to WDW. Many books categorized the fright factor by preschool, grade school, teens and so on. Still, I'm still not sure if my child should ride rides like Big Thunder Mountain Railroad, Kali River Rapids, Splash Mountain, or Dinosaur. Her dad will be with her but I don't want to ruin her trip by going too far too soon. Any Advise?