Addams Family Values probably deserves an honorable mention because the summer camp storyline is just that iconic.
EXACTLY.

I thought of this post again because I just started a book last night called That Summer Feeling by Bridget Morrissey, which has the wonderful premise of a woman in her 30s going to spend a week at a sleepaway camp for adults where she runs into a man from her past, only to fall for his sister instead. I'm not far in at all, but I really like the prologue and first chapter. I'll let you know how it is after I've finished!