The Little Mermaid: Ariel's Undersea Adventure is a track ride in Paradise Park at Disney's California Adventure. While it's not the best, it is also recommended.
The Little Mermaid: Ariel's Undersea Adventure is a new dark ride that debuted at California Adventure officially on June 3, 2011. The old "Palace of Fine Arts" entryway to the now-gone Golden Dreams show remains, and will be part of The Little Mermaid building's facade. But once inside, this is a, well, "whole new world."
You'll travel "underwater" in clam-shell ride vehicles to visit Ariel's grotto, see Sebastien conduct a sea-creature orchestra and encounter Ursula's lair.