I could see nearly this entire show being projection mapped. Some concepts for your reading pleasure:
- Just before the show begins, an announcer asked guests to find a viewing spot, as much of the park lighting will be dimmed for the duration of the show. At the start of the show, the lighting is turned down so particularly that the tall buildings disappear. Our narrator starts "There has always been a lighthouse." The lighthouse shines bright across the lagoon, and is seen as a lone structure in the park. (Need an epic start)
- Spidey swings across the lagoon-side buildings. Hulk glows a radioactive green while the spires of Doom spark with electricity.
- We hear the stomp of a T-rex, and the entire lagoon ripples. Another stomp. Ripples. BOOM. Ripples. ROOOOAR! The shadow of a T-rex is seen across the whole facade of the Discovery Center.
- Zeus and Poseidon battle on Mythos.
There's not a lot of physical objects to project onto, let alone ones that are visible from all viewing locations. Any kind of show would need a central focal point, so screens would probably be needed.