I have to agree with others a map, no matter how basic, would have extremely helped. This is a cool and evocative setting but at the moment I'm kind of at a loss for what brings the PCs to the island and why they would even do this at night? Perhaps a shipwreck or something. Really it doesn't matter, the GM can determine that but the adventure/setting seemed to lack a bit of direction.
Love the "Best me ever munched!" line for the troll. The adventure is filled with character and memorable NPCs. The whole 'skeletons can't blow into a flute' thing is genius.