If you think basing an entire movie off of a theme park attraction seems like a stupid idea, just ask Johnny Depp and the minds behind the Pirates of the Caribbean franchise, because in my opinion, that's exactly what that first movie was, and they seem to be doing pretty well.
The thing is, with huge blockbuster movies come professional PR moves to promote the movie. That's when you gotta get creative.
How creative? Well, how about taking arguably the world's largest box-office star and having him surprise a group of tourists on the ride that you're basing your upcoming movie on?