A flute

[ernestww]

A flute to combat cabin fever.  Perhaps craftable.  Make playing the flute a skill so that after finding the music book or the 'How to make a Flute' book the character then advances and is able to play some simple tunes.  There would be a well being benefit counteracting cabin fever.

[ernestww]

Another thought along the same lines could be to replace the photos or art on the wall of your cabin with a drawing based on an event in the last couple of days. 

You could draw on birch bark with a burnt stick.  

[alone sniper]

+1 To flute Idea !!!!