Violin would be awesome to learn, so would banjo. I think I'm a fan of instruments you don't need amplifiers for.

(He leans back against the wall, smiling, as she starts to sing. Her voice is beautiful and it feels nice to be able to share something like this with someone, the last month has been wild and this feels like a small pocket of tranquility. The calm before another storm.
When she is done the song he gives her a small round of applause, making sure to keep it quiet as to not scare the rabbit she is holding.)

That was lovely! You have a beautiful voice.