Professor Frizzle's kid sister Fiona might be the new teacher at Walkerville Elementary, but she's got the same old motto: take chances, make mistakes, and get messy! When the class decides to go to Hawaii for their latest fieldtrip, they think they're in for rest, relaxation, and riding the waves. But when Wanda tries to save an endangered fish from a giant shark, it's Wanda who needs saving. Luckily her own class learns something from a totally different type of school--fish!