Four girls in the summer before their senior year come to spend a month in a secluded cabin in the Adirondacks, where they have adventures and bond. As usually happens in this subgenre, this involves rejecting the expectations of their parents and finding their true callings. The adventures are mostly unremarkable (car trouble, a romance, helping a family in need), but each of the young women go through a very satisfactory personal growth arc in the story. That said, the most interesting story probably belongs to the fifth character (the owner of the summer house and the grandmother of one of the girls).
At 470 pages, it seemed terribly long and it wore me out. It begins strong with a certain amount of tension between the characters, but they break through that quickly and the second half of the novel treads water. And while the girls start out different, they gradually lose their distinctiveness, which I guess is how we know that they are all getting along.