Everything I play, I play for enjoyment, especially when I'm learning or polishing. Maybe it would be different if I were not just an amateur.
Most pieces I learn start with poking around with them for fun, unless my teacher gives it to me. I did a lot of the Schubert sonatas, especially D 845 and 958, without actually learning them so far, as well as a bunch of easier anthologies. Also, I don't typically spend much time refining aged repertoire, so it's usually just played for enjoyment. I suppose I do anything for sightreading as long as it's manageable.
Beethoven Moonlight Sonata first movement. Just bringing out the bass lines a bit more than usual. Kinda calms me. Any of the Chopin Preludes, especially number 15. I feel like his Preludes are like collection of beautifully written short stories that speak about all aspects of life. There's happiness, sadness, longing, rage, tranquility, hope, despair, victoriousness, loss, confusion, contentment, satisfaction, grief,... Just wonderful music