I also used the fish camp adventure as a base for the party and they love it. Last session they decided to finally deal with the ghost that haunts one of the rooms, and they decided maybe the mayor could help them out.

I took it as an opportunity to introduce Doriana to the party as they hadn't met her yet and I want them to get some face time with her before they finish level 4. So the party goes to the mayor's house thinking they'll get an audience with him, and while they're waiting for him, Doriana wanders out and has a conversation with the party and they can instantly tell there's something special about her.

Then one of the players is like "what if we bring this girl to the ghost?" And in my head I was like "fuck yeah, who better to help exorcise a ghost than a psychic?" But I kept my mouth shut and let the players run with the idea. They ended up getting the mayor's permission to bring her on a "field trip" to their fishing cabin, and I got to play out how the ghost possessed her as soon as she entered the room which I figured made it easier to talk to and negotiate with.

The players absolutely loved this interaction and they straight up asked me afterward if that was the "intended" solution to the ghost room and I was like "fuck no, these characters aren't even from the same adventure" which made the players absolutely overjoyed. They loved the idea that the game is enough of a sandbox that they could just find and use different mechanics from different stories to solve a complex problem.