"Two teenagers on a romantic spring break in a remote cabin discover, to their horror, that they both share the same father. And he was a Nazi. And the cabin is surrounded by Jewish zombies."

Interesting Idea. Can see this as a Cabin-house horror comedy mixed with a hint of Tarantino.

A couple of suggestions:
-Description of the characters (eg. A Pair of innocent teenagers)
- Specifics of the location to create drama (remote cabin is good, but a remote cabin in a Jewish-populated New York State forest is better)