An attraction named "The Industrial Revolution" a coaster with a loop/loops as well as I believe a launch at the beginning, was planned for Disney's America, the park never built in Virginia. This coaster was to be themed as a trip through at 19th century east coast industrial city steel mill. The theme would include molten metal and steam as well as the industial infrastructure of an old steel mill. This could easily be added to the area just behind Broadway Theater and the Tower of Terror in New York Waterfront.
The Hangar Stage Theater in Lost Delta could give up the back 2/3 of it's building and become a smaller restaurant space with a small stage for music, kind of like an older central American jungle version of the hangar restaurant in Condor Flats at Disney's California Adventure. This would free up the back 2/3 of this building plus the backstage area between it and the back of Mermaid Lagoon for a Little Mermaid dark ride expansion accessible via the Mermaid Lagoon show building.
Next to the Sinbad attraction, to the left of the entrance there are a lot of trees -and behind that are 3 rectangular backstage buildings. This area could easily fit an Aladdin dark ride attraction.
The area next to Lost River could be made into a jungle raft ride simular to the one in Asia at Animal Kingdom or the Grizzly River Rapids at California Adventure, of course with a Central American Jungle Theme.