In this file photo from March 13, 2008 released by Disney, the character Crush, the turtle from Disney Pixar's "Finding Nemo," surfs along the parade route during a rehearsal for the new Pixar Play Parade at Disney's California Adventure Park in Anaheim, Calif.
This undated photo released by Canada's Wonderland shows the Behemoth roller coaster in Vaughan, Ontario.
People are shown floating down Roa's Rapids, under a waterfall at Sea World's Aquatica water theme park in Orlando, Fla., Friday, May 16, 2008.
** FILE ** In this file photo from May 15, 2008, Shane Araujo, 7, left, and Vitoria Poejo, 7, of New York City, pose with super heroes Robin, The Green Lantern, and Batman at Six Flags Great Adventure in Jackson, N.J. The amusement park opened its newest roller coaster, "Dark Knight," to the public on this day.
The entrance to the new Simpsons Ride at Universal Studios is shown in Orlando, Fla., Wednesday, April 30, 2008.
This undated photo released by Hersheypark shows the roller coaster "Fahrenheit" at Hersheypark in Hershey, Pa.
In this file photo from March 13, 2008 released by Disney, the character Heimlich from Disney Pixar's "a bug's life" goes to pieces along the parade route during a rehearsal for the new Pixar Play Parade at Disney's California Adventure Park in Anaheim, Calif.
* FILE ** In this file photo from May 14, 2008, Lindy Browand,17, left and her father, Vince Browand, 47, ride the Thunderhawk as it was in use for the first time at Michigan's Adventure Amusement Park in Muskegon County. The Thunderhawk is the first inverted roller coaster in Michigan and climbs to 105 feet featuring more than 2,000 feet of loops, twists and turns at speeds of up to 50 miles per hour.
In this file photo from March 13, 2008 released by Disney, the character Jack Jack, from Disney Pixar's "The Incredibles", rides atop the Omnidroid during a rehearsal for the new Pixar Play Parade at Disney's California Adventure Park in Anaheim, Calif.
This undated photo released by Cedar Point, shows people on a ride at the new Planet Snoopy area for kids at Cedar Point amusement park in Sandusky, Ohio.