"A shrewd thriller that's both smarter and funnier than you'd expect. "

"Young couple butchered in Honolulu!" says the headline, none-too-subtly, on the front page of a Hawaiian newspaper near the beginning of A Perfect Getaway. That bit of outlandishness aside, this is a shrewd thriller that's both smarter and funnier than you'd expect. Even if you guess where it's going before it gets there, the ride is fun.

Our non-murdered honeymooners are Cliff (Steve Zahn) and Cydney (Mill…