As the world's largest tourist attraction, Walt Disney World has a huge incentive to innovate and move as many people as possible through its four theme parks with the least amount of unpleasantness. To date, 12 million of its MagicBands have been distributed. This summer may bring the device's pluses and minuses into focus.

Plus A simple wristband is your hotel room key, your credit card, your theme park ticket, fast passes, dinner reservations. It can even play host to pictures taken in the park that you can download later and buy.

MINUS If you don't plan ahead you'll soon find that all the good fast passes and dinner reservations were scooped up weeks ago by savvy Disney regulars and tourists who plan ahead. There is also the nagging feeling that your spending is being tracked.

Here's what's new in the Disney parks this summer:

Magic Kingdom This weekend brings back the popular 24-hour summer kickoff, with the park open from 6 a.m. Friday to 6 a.m. Saturday. The idea of floating through It's a Small World in the middle of the night really draws crowds. Some of the new features in the Magic Kingdom this summer are the new hub in front of Cinderella's castle, a prime spot for fireworks viewing. There's also a new interactive queue at the Peter Pan ride that makes the long lines there more tolerable -— and air conditioned.

Hollywood Studios The summer-only Frozen extras return with a special fireworks show that Let it Go in a big way. There's also a parade of Frozen characters, and a sing-along show is moving to a new Frozen-themed theater where the old American Idol Experience was. Also, Star Wars Weekends has returned to Hollywood Studios weekends through June 14. June 12-14 brings Frank Oz (Yoda) for his first appearance at the fan fest, as well as Ray Park (Darth Maul) and Peter Mayhew (Chewbacca). See StarWarsWeekends.com for the full lineup.

Epcot A new five-member a capella group called American Music Machine will remind you of the movie Pitch Perfect with unaccompanied vocal pop tunes providing the be-bopping background sounds. The show's vocal arranger, Tim Davis, also arranged vocals on Glee and has a long resume of vocal pyrotechnics, including a gig conducting the men's barbarian choir for the video game The Elder Scrolls V: Skyrim. They perform in the America Gardens Theatre stage Wednesdays through Sundays.

Animal Kingdom A new outdoor market of food and drink options called Harambe Market opens this weekend with a covered seating area for 250. You can find curry-spiced corn dogs, ribs, skewered meat and African wines and beers.

On the horizon Pandora: The Land of Avatar is under construction in Animal Kingdom. Based on the world created in James Cameron's film, the land is scheduled to open in early 2017.