Sometimes going camping might not be the best idea. Especially if you pick the wrong spot. The movie tries to be smart about the beginning and the setting and it does work for a second. But you will get what they do with the two parties at the beach in no time. What you make of it and how you react to this is up to you (that's if you like the editing).
The acting is decent, but the movie does feel to be longer than it actually is. Not really a feel good movie overall of course, but you'd wish it would speed up a little bit. It's predictable overall which I won't hold too much against the movie. But it is dreadful in a bad way and it doesn't really add anything new. So as someone else suggested, there are way better entries, with similar topics that are way better