Universal Studios has two parks. Universal Studios and Islands of Adventure. Islands of Adventure is where the first addition to the parks was for Wizarding World of Harry Potter. It is called Hogesmeade. Within Hogesmeade is the awesome castle which contains The Forbidden Journey ride. It is a site to behold. Also within Hogesmeade you will find the dueling dragons ride and the Flight of the Hippogriff. Place to dine here is the Three Broomsticks. There are also shops there.
You can then take the Hogwarts Express to The newest addition to the WWOHP " Diagon Alley "this is located in Universal Studios. It has The ride Escape from Gringotts. There are shops also located here as well as The Leaky Cauldron restraurant, Ollivanders Wand shop.
Go to Universal Orlando site and you can look at the map at the bottom of the page and it will give you a great map to get a feel for both parks.
You will find that Universal Studios is a easy to navigate.
If you stay at Royal Pacific, Portofino Bay or Hardrock you get Express pass included with your stay. Also included in your stay as a guest of all onsite resorts is one hour early admission to one of the theme parks depending on which one is opening early the mornings you are there.
You need park to park ticket as noted above.
Also there is citywalk for dining and entertainment.
Enjoy your planning. Have a great trip to Universal
