A while back my players ran into the Demon Bat-God Camazotz. He managed to get away with the what he thought was the heart of the Sun God (it was his liver). Since then my players have been itching for a rematch against him. This adventure might just be the thing.
While the creature here is listed as "Servant of the Bat God" a little tweaking and I could make this into a coastline being terrorized by the Bat God himself.
The characters have three days to complete their task, so it's a nice tight adventure, exactly what I want, and it weighs in at just under 60 pages.
In any case there is a lot of good stuff here to use.
[5 of 5 Stars!]