|Zachary Gordon||Greg Heffley|
|Devon Bostick||Rodrick Heffley|
|Rachael Harris||Susan Heffley|
|Steve Zahn||Frank Heffley|
|Peyton List||Holly Hills|
|Karan Brar||Chirag Gupta|
|Laine MacNeil||Patty Farrell|
It's summertime, and Greg Heffley is looking forward to playing video games and spending time with his friends. However, Greg's dad has other plans: He's decided that some father-son bonding time is in order. Desperate to prevent his dad from ruining summer vacation, Greg pretends he has a job at a ritzy country club. But Greg's plan backfires, leaving him in the middle of embarrassing mishaps and a camping trip gone wrong.