I particularly enjoyed the movie. It was quite a bit cheesy, but kids 10-13 should enjoy it, and teens my age and up... Well, it depends on the person (I'm 14, by the way).
Language: None. There was some name-calling and some impolite things,like, dork, stupid, shut up, etc...
Sex: A couple of background kisses at a "senior vampire party," and 2 implied make-outs between a human and a vampire.
Drug and Alcohol: None. One girl made one comment, "Besides, no one here is even drinking." To which another girl replied, "Not yet..." Though the second WAS referring to it as a vampire-drink theme, and the first was speaking about alcohol.
Violence: Your typical cheesy violence, not very literal. You see a few vampires smoking from UV burns and water burns, and you see no blood at all in the movie.
Overall, it was very clean, and something kids should enjoy. :)