Take the Alice's Tea Party ride from Tokyo Disneyland, remove a bunch of the cups so the attraction is on a smaller scale, change the names of the cups from "tea cups" to "kelp cups" (whatever those are), throw in an added twist by making the cups move in a figure-eight pattern, and you have The Whirlpool.
This one's a little wilder than some of the other rides in Mermaid Lagoon, so very young kids (and those of us who don't like spinning around in a circle) will probably want to pass this one by.