As it was nearly midnight, I wound the adventure up there, allowing them to escape the island with their loot and their stories, mourning the deaths of their two elvish comrades. The magic user used his Helm of Comprehend Languages to communicate with Boby the Mechanical Owl, allowing him to ask questions about some things they hadn’t fully understood.
If we had had more time, I would have had Talos stomp on their boat and stop them from leaving. Of course by this time they had the Wings and some other items that might have allowed them to escape.
Conclusion: It was a fun evening that put the adventure through its paces. I plan to incorporate what I learned from the playtest into a revised version.