Universal's Islands of Adventure is a theme park in Orlando, Florida. It opened on May 28, 1999, along with CityWalk, as part of an expansion that converted Universal Studios Florida into the Universal Orlando Resort. The slogan for this theme park, along with Universal Studios Florida, is Vacation Like You Mean It, introduced in 2013 as Universal Orlando Resort.The park's overall theme is that of a journey of exploration, where guests depart from a main port to visit themed islands, all emphasizing adventure. Initially, the park had six islands. On June 18, 2010, the seventh island, The Wizarding World of Harry Potter, officially opened at the park. This is Universal's largest investment since opening. In 2013, Islands of Adventure hosted approximately 8.1 million guests, ranking it seventh among United States parks and eleventh worldwide. The eighth island, Skull Island, opened on July 13, 2016.Licensed properties included at Islands of AdventureLike Universal Studios Florida next door, Islands of Adventure has not limited itself to Universal's own library, because it licensed other characters from rival studios, many of whom did not own theme parks of their own, as attractions and lands. Some of these include: Dr. Seuss properties Popeye (King Features Syndicate) Marvel Comics (Marvel Entertainment).