Summer Vacation follows the coming of age adventures of Brit Holland, who is eighteen going on twenty-five. His dysfunctional family consists of his alcoholic parents and his older sister, Yvette, who is addicted to marijuana and willing to do anything to acquire it. For their vacation this year, they are going to the beach, specifically because Brit's father, Bill, wants to enter a poker tournament. There are only two requirements for his parents' fun-gambling and abundant alcohol. Bill leaves his wife, Charlene, to her own devices and she is offended that he prefers gambling to spending time with her. She soon meets a young man who is determined to get her in bed and is providing all the alcohol she can consume. Yvette befriends an over-protected eighteen-year-old girl who is quickly attracted to Brit. However, Brit is busy pursuing an experienced woman who is ten years older, so close yet so far away. The stage is set for the Summer Vacation of their lives.