There are 6 attractions at Islands of Adventure we rate as "Not To Be Missed":

Not To Be Missed at Islands of Adventure
Jurassic Park Jurassic Park River Adventure
Marvel Super Hero Island The Amazing Adventures of Spider-Man
The Incredible Hulk Coaster
The Wizarding World of Harry Potter - Hogsmeade Dragon Challenge
Harry Potter and the Forbidden Journey
Hogwarts Express - Hogsmeade Station

Not To Be Missed Attractions at Other Parks