"The scenes that people liked best were not the obvious things like the big battle scenes," Cameron said.
"It was the creatures, it was learning to fly, it was being in the forest at night.
"So here's an opportunity ... to bring this world to life and get you to wander in it and see things you didn't see in either in the first film or the subsequent two."
Cameron is working on the second and third instalments of Avatar, to be released in December 2014 and December 2015. The park will include elements of the second and third films and elements that aren't included in any of the films.
The first instalment of Avatar was a 3D movie about a race of blue-skinned Na'vi who defend the moon they live on from invading humans.
It has grossed about $2.8 billion in theatres worldwide since its December 2009 release and has brought in many millions more from home video sales.
News Corp's Twentieth Century Fox, the studio that distributed Avatar, is also a partner in the theme park and will distribute the next two films.
It's not unusual for Disney to partner on projects that weren't produced at its own studio.
It opened an Indiana Jones attraction at Disneyland in 1995 in partnership with Lucasfilm even though the film was distributed by rival studio Paramount, which is owned by Viacom Inc.
Disney CEO Bob Iger said the long-term agreement includes the possible expansion of Avatar to Disney's other parks worldwide, but there are no immediate plans to do that.
Cameron, his company, Lightstorm Entertainment, and producing partner Jon Landau will not get a cut of theme park ticket revenues.
But they will help develop the area under a licensing deal that includes royalties on food and beverage sales, Staggs said.
The area should help create thousands of jobs, he added.
- AAP
