Yeah, uh, I'd argue that How to Train Your Dragon is the best thing DreamWorks has put out, and it's all thanks to their decision to scrap what had been done with the project and bring in Chris Sanders and Dean DeBlois (the guys behind Lilo & Stitch). They had an amazing team working on it and it took some pretty progressive risks for an animated children's movie. I'd love to see it get Studios representation and a dark ride would put me on cloud nine.
While I have lots of issues with Madagascar, I think it would translate wonderfully into a flume ride if, as others have said, you added a drop or improved the storyline (assuming we're talking a Crate clone thing).
And an E.T. makeover is imperative at this point, even if it's just a facelift.