It turned out to be somewhat pointless because once you know how, you can easily skip the night phase altogether. A game where you can't do that might be interesting.
Also: preparing for floods. What happens when the river overflows or the storm surge hits?
Another idea: build a sand castle and see how long you can hold out against the rising tide. No bad guys involved, just waves. Almost a literal sandbox game.
Hey, it works in Minecraft. (But in Minecraft, you have to earn it.)
I didn't expect I'll be googling that phrase ever in my life. :o.