Grizzly River Run is a rapids ride in Grizzly Peak at Disney's California Adventure. While it's not the best, it is also recommended. The minimum height to ride is 42 inches.
Billed as the longest, tallest and fastest "tub-style" river raft ride in the world. Look to get plenty wet, but don't expect the characters and songs that Disney delivered on its "Splash Mountain" log flume rides.