Derek (Michael Seater) and Casey (Ashley Leggat) are back and continue their hilarious sibling rivalry when the McDonald-Venturi kids visit the girls' difficult grandmother at her beautiful lakefront lodge. Things heat up with Casey when she meets, Jesse, a handsome young dancer who is a waiter at the lodge. Meanwhile as Derek is 'chilling' on his vacation, he falls for Roxy (Kristen Gutoskie), the rich girl who lives across the lake. But when Roxy's father, a greedy land developer, threatens to destroy the natural beauty around them, the McDonald-Venturi kids band together to save the lake and the lodge in Vacation with Derek.
