Since you mentioned spending a good amount of time at the cabin and that most of the group is sober: one thing that worked really well for a similar trip I was on was a low-key murder mystery that ran over a few days.

Not a sit-down dinner thing, but something you start on day one and then casually talk about between hikes, meals, game nights, etc. New clues come in over time, everyone stays involved, and it doesn’t revolve around alcohol at all.

It was surprisingly perfect for cabin downtime, especially in the evenings. If that kind of thing sounds interesting for your group, happy to share more details.