"Donkey Kong's Mine Cart Madness" sounds good IMO. And I also agree, that DK should get its own sub-area. Something with the Mine Cart ride, the post-ride gift shop (of course!), a little Camp Jurassic-esque playground area, and a tropical food stand with bananas. They could probably condense that all into around 2-ish acres, which wouldn't take up too much room to the main focus, the Mushroom Kingdom.