Before Steven Spielberg tackled cloned dinosaurs, James Cameron was circling the project. Ultimately, Cameron admits Spielberg was the right choice to direct Jurassic Park.
“[Spielberg] was the right guy to make it. Not me, because I would have made it too terrifying and R-rated. It would have been “Aliens” with dinosaurs.”
Still would've been interesting, nonetheless. Especially a Cameron-directed The Lost World: Jurassic Park.
Source: Empire Magazine