Splash Mountain is the best ride in all of Walt Disney World.
The theme and ride platform is perfectly palatable to all ages. You are face-to-face with Cinderella Castle at the big drop (actually, it could be the same height, need a reference to confirm) and the story continues after the big splash. There's a coaster feel to a drop that is inside, where you descend and ascent back into the next scene.
Ellen's Energy Adventure is the worst ride in all of Disney World.
This educational experience starts at the queue. Videos continue after you're loaded into a large, uncomfortable, slow-moving ride vehicle. The highlight is towards the end of the ride, where you get to see the original, old animatronic dinosaurs. What makes it really bad is the wait after the payoff-more videos. Good for 40 min nap.